--- title: "Best MUJI Pens: Gel, Ballpoint & Compact Compared" canonical: "https://stationerytimes.com/guides/best-muji-pens/" description: "The best MUJI pens compared by use: gel pens in 0.3, 0.38 and 0.5 mm, oil ink ballpoints, and the compact gel and fountain pens, with lengths and origins." category: "Pens" published: 2026-11-01 updated: 2026-11-01 author: "Ellis Penhale" publisher: "Stationery Times" sources: 8 products: - name: "MUJI Gel Ink Ballpoint Cap Type Pen 0.38 mm" brand: "MUJI" brand_origin: "Japan" made_in: "Japan" material: "Polypropylene, ABS resin and steel (per MUJI USA)" price_band: "$ (under $5 per pen (multi-packs divided by the count), typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Gel Ink Ballpoint Pen, cap type, 0.38 mm" sku: "4550002794262" gtin: "4550002794262" url: "https://www.muji.us/products/gel-ink-cap-type-pen-0-38mm" guide: "https://stationerytimes.com/guides/muji-gel-ink-pen/" - name: "MUJI Gel Ink Ballpoint Knock Pen 0.5 mm" brand: "MUJI" brand_origin: "Japan" made_in: "Japan" material: "Polycarbonate body, ABS resin upper and tip, copper spring screw, polypropylene refill with copper tip (per MUJI USA)" price_band: "$ (under $5 per pen (multi-packs divided by the count), typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Gel Ink Ballpoint Pen Knock Type 0.5mm" gtin: "4550002794118" url: "https://www.muji.us/products/gel-ink-ballpoint-pen-knock-type-0-5mm" guide: "https://stationerytimes.com/guides/muji-gel-ink-knock-pen-0-5mm/" - name: "MUJI Smooth Gel Ink Ballpoint Knock Pen 0.3 mm" brand: "MUJI" brand_origin: "Japan" made_in: "Japan" material: "Polycarbonate, ABS resin, steel and polypropylene (per MUJI USA)" price_band: "$ (under $5 per pen (multi-packs divided by the count), typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Smooth Gel Ink Ballpoint Knock Pen 0.3 mm" gtin: "4550344872703" url: "https://www.muji.us/products/smooth-gel-ink-knock-type-ballpoint-pen-0-3mm" guide: "https://stationerytimes.com/guides/muji-smooth-gel-ink-knock-pen/" - name: "MUJI Smooth Oil Ink Ballpoint Pen 0.5 mm" brand: "MUJI" brand_origin: "Japan" made_in: "Japan" material: "Tip: polypropylene and thermoplastic elastomer; shaft: ABS resin (per MUJI USA)" price_band: "$ (under $5 per pen (multi-packs divided by the count), typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Smooth Oil Ink Ballpoint Pen 0.5 mm - Black (NBE04A3A)" gtin: "4550583768157" url: "https://www.muji.us/products/smooth-oil-ink-ballpoint-pen-0-5-mm-black-nbe04a3a" guide: "https://stationerytimes.com/guides/muji-smooth-oil-ink-ballpoint-pen/" - name: "MUJI Oil Ink Polycarbonate Ballpoint Pen 0.7 mm" brand: "MUJI" brand_origin: "Japan" made_in: "Japan" material: "Polycarbonate and elastomer (per MUJI USA)" price_band: "$ (under $5 per pen (multi-packs divided by the count), typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Oil Ink Polycarbonate Ballpoint Pen 0.7mm" gtin: "4548718444434" url: "https://www.muji.us/products/oil-ink-polycarbonate-ballpoint-pen-0-7mm-s444" guide: "https://stationerytimes.com/guides/muji-oil-ink-polycarbonate-ballpoint-pen/" - name: "MUJI Compact Gel Ink Ballpoint Pen Cap Type 0.5 mm" brand: "MUJI" brand_origin: "Japan" made_in: "China" material: "Polycarbonate body; aqueous gel ink (per MUJI USA)" price_band: "$ (under $5 per pen (multi-packs divided by the count), typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Compact Gel Ink Ballpoint Pen Cap Type 0.5mm - Black" gtin: "4550344162446" url: "https://www.muji.us/products/compact-gel-ink-ballpoint-pen-cap-type-0-5mm-black" guide: "https://stationerytimes.com/guides/muji-compact-gel-ink-pen/" - name: "MUJI Compact Fountain Pen" brand: "MUJI" brand_origin: "Japan" made_in: "China" material: "Polycarbonate body, ABS resin parts (per MUJI USA)" price_band: "$$ ($5–20 per pen (multi-packs divided by the count), typical US retail, October 2026)" manufacturer: "Ryohin Keikaku Co., Ltd." model: "Compact Fountain Pen (NBF4CC4S)" gtin: "4550583693404" url: "https://www.muji.us/products/compact-fountain-pen-nbf4cc4s" guide: "https://stationerytimes.com/guides/muji-compact-fountain-pen/" --- # Best MUJI Pens: Gel, Ballpoint & Compact Compared > On published specs, the MUJI Gel Ink Ballpoint Knock Pen 0.5 mm is the best MUJI pen for most people: 14.5 cm long, 16 colors, quick-drying gel ink, a clip, and made in Japan. Choose the 0.3 mm knock for fine lines, the oil ink pens for ballpoints, and the compact pens for A7 notebooks. - URL: https://stationerytimes.com/guides/best-muji-pens/ - Category: Pens - Author: Ellis Penhale - Published: 2026-11-01 - Updated: 2026-11-01 ![Seven MUJI pens drawn to scale, five at 14 to 14.5 cm and two compact pens at 11 cm](https://stationerytimes.com/images/raster/best-muji-pens-illustration-16x9.png?v=c12504ed) *The seven picks to scale (1 mm = 3 px), longest first, two columns.* Original illustration made for this guide. © Stationery Times. Original drawing (SVG): . Drawings © 2026 Stationery Times, reusable with credit under CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/). ## Product facts | Product | Brand | Brand origin | Made in | Material | Released | Price range (typical US retail, October 2026) | |---|---|---|---|---|---|---| | MUJI Gel Ink Ballpoint Cap Type Pen 0.38 mm | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | Japan | Polypropylene, ABS resin and steel (per MUJI USA) | – | $: under $5 per pen (multi-packs divided by the count) | | MUJI Gel Ink Ballpoint Knock Pen 0.5 mm | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | Japan | Polycarbonate body, ABS resin upper and tip, copper spring screw, polypropylene refill with copper tip (per MUJI USA) | – | $: under $5 per pen (multi-packs divided by the count) | | MUJI Smooth Gel Ink Ballpoint Knock Pen 0.3 mm | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | Japan | Polycarbonate, ABS resin, steel and polypropylene (per MUJI USA) | – | $: under $5 per pen (multi-packs divided by the count) | | MUJI Smooth Oil Ink Ballpoint Pen 0.5 mm | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | Japan | Tip: polypropylene and thermoplastic elastomer; shaft: ABS resin (per MUJI USA) | – | $: under $5 per pen (multi-packs divided by the count) | | MUJI Oil Ink Polycarbonate Ballpoint Pen 0.7 mm | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | Japan | Polycarbonate and elastomer (per MUJI USA) | – | $: under $5 per pen (multi-packs divided by the count) | | MUJI Compact Gel Ink Ballpoint Pen Cap Type 0.5 mm | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | China | Polycarbonate body; aqueous gel ink (per MUJI USA) | – | $: under $5 per pen (multi-packs divided by the count) | | MUJI Compact Fountain Pen | MUJI (by Ryohin Keikaku Co., Ltd.) | Japan | China | Polycarbonate body, ABS resin parts (per MUJI USA) | – | $$: $5–20 per pen (multi-packs divided by the count) | - Made in (MUJI Gel Ink Ballpoint Cap Type Pen 0.38 mm): Japan. MUJI USA's product details for the 0.38 mm cap-type pen give "Country/Region of Origin: Japan", and MUJI Japan's page for the gel ink refill lists 原産国 (country of origin) 日本 (Japan). We read both on October 21, 2026. Source: https://www.muji.us/products/gel-ink-cap-type-pen-0-38mm - Made in (MUJI Gel Ink Ballpoint Knock Pen 0.5 mm): Japan. MUJI USA's product details give "Country/Region of Origin: Japan" for all 16 colors. Source: https://www.muji.us/products/gel-ink-ballpoint-pen-knock-type-0-5mm - Made in (MUJI Smooth Gel Ink Ballpoint Knock Pen 0.3 mm): Japan. MUJI USA's product details give "Country/Region of Origin: Japan" for all five colors. Source: https://www.muji.us/products/smooth-gel-ink-knock-type-ballpoint-pen-0-3mm - Made in (MUJI Smooth Oil Ink Ballpoint Pen 0.5 mm): Japan. MUJI USA's product details give "Country/Region of Origin: Japan" for the 0.5 mm black pen. Source: https://www.muji.us/products/smooth-oil-ink-ballpoint-pen-0-5-mm-black-nbe04a3a - Made in (MUJI Oil Ink Polycarbonate Ballpoint Pen 0.7 mm): Japan. MUJI USA's product details give "Country/Region of Origin: Japan". Source: https://www.muji.us/products/oil-ink-polycarbonate-ballpoint-pen-0-7mm-s444 - Made in (MUJI Compact Gel Ink Ballpoint Pen Cap Type 0.5 mm): China. MUJI USA's product details give "Country/Region of Origin: China" for the black cap-type pen. Source: https://www.muji.us/products/compact-gel-ink-ballpoint-pen-cap-type-0-5mm-black - Made in (MUJI Compact Fountain Pen): China. MUJI USA's product details give "Country/Region of Origin: China". Source: https://www.muji.us/products/compact-fountain-pen-nbf4cc4s ## Key takeaways - We compare seven MUJI USA pens: three gel pens (0.3, 0.38 and 0.5 mm), two oil ink ballpoints, a compact gel pen and a compact fountain pen. - Five of the seven are 14.0 to 14.5 cm long; the two compact pens are 11 cm, and the oil ink polycarbonate ballpoint is the thickest at 1.5 cm across. - Six single-pen listings fall in our $ band (under $5) at US$2.40 to US$2.90 each; the compact fountain pen is $$, at US$18.90. - The four full-size gel and oil ink pens are made in Japan; both compact pens are made in China, per MUJI USA. - MUJI sells most of these in 3 to 16 colors, and says its cap and knock bodies share refills in Japan. ## What is the best MUJI pen? **On published specs, the Gel Ink Ballpoint Knock Pen 0.5 mm is the best MUJI pen for most people, while the best pick for fine lines, oil ink, a thick grip or a pocket is a different pen.** It's #1 because it is a retractable pen with a clip, 14.5 cm long, in 16 colors, with quick-drying gel ink and a refillable body, made in Japan. - **Best overall:** [MUJI Gel Ink Knock Pen 0.5 mm](https://stationerytimes.com/guides/muji-gel-ink-knock-pen-0-5mm/). *Why it's here:* 14.5 cm (5.7 in), 16 colors and a clip, per MUJI USA, at one price in our $ band. - **Best for fine lines:** [MUJI Smooth Gel Knock Pen 0.3 mm](https://stationerytimes.com/guides/muji-smooth-gel-ink-knock-pen/). *Why it's here:* the finest MUJI gel size, 0.3 mm, in five colors. - **Best for planners:** [MUJI Gel Ink Cap-Type Pen 0.38 mm](https://stationerytimes.com/guides/muji-gel-ink-pen/). *Why it's here:* 10 colors at 0.38 mm, 14 cm long, and MUJI says its refills fit cap and knock bodies. - **Best ballpoint:** [MUJI Smooth Oil Ink Ballpoint 0.5 mm](https://stationerytimes.com/guides/muji-smooth-oil-ink-ballpoint-pen/). *Why it's here:* quick-drying oil ink, a grip to the tip and three ball sizes, with refills MUJI says are interchangeable. - **Best thick pen:** [MUJI Oil Ink Polycarbonate Ballpoint 0.7 mm](https://stationerytimes.com/guides/muji-oil-ink-polycarbonate-ballpoint-pen/). *Why it's here:* 1.5 cm across and 14.0 cm long, with oil ink MUJI says withstands a light wash. - **Best compact gel pen:** [MUJI Compact Gel Pen 0.5 mm](https://stationerytimes.com/guides/muji-compact-gel-ink-pen/). *Why it's here:* 11 cm long with a clip, made for A7 notebooks, in 12 cap-type colors. - **Best fountain pen:** [MUJI Compact Fountain Pen](https://stationerytimes.com/guides/muji-compact-fountain-pen/). *Why it's here:* the only fountain pen, 11 cm with a 0.5 mm nib and two cartridges included. ## How did we choose these picks? **We compiled these picks from MUJI USA's own product pages, not hands-on testing.** We took every MUJI USA pen that has its own guide on Stationery Times, kept one listing per family, and picked one per need. MUJI's Japanese site wouldn't load from our server on November 1, 2026, so there are no yen prices. ## How do the seven MUJI pens compare? **Five are 14.0 to 14.5 cm long; the two compact pens are 11 cm.** | Pen | Length | Nib or ball | Ink | Made in | Band | |---|---|---|---|---|---| | Gel Knock 0.5 mm | 14.5 cm (5.7 in) | 0.5 mm | Aqueous gel | Japan | $ | | Smooth Gel Knock 0.3 mm | 14.5 cm (5.7 in) | 0.3 mm | Aqueous gel | Japan | $ | | Gel Cap-Type 0.38 mm | 14 cm (5.5 in) | 0.38, 0.5, 0.7 mm | Gel | Japan | $ | | Smooth Oil Ink 0.5 mm | 14.1 cm (5.6 in) | 0.38, 0.5, 0.7 mm | Oil | Japan | $ | | Oil Ink Polycarbonate | 14.0 cm (5.5 in) | 0.7 mm | Oil | Japan | $ | | Compact Gel Cap-Type | 11 cm (4.3 in) | 0.5 mm | Aqueous gel | China | $ | | Compact Fountain | 11 cm (4.3 in) | 0.5 mm | Cartridge ink | China | $$ | Lengths are MUJI USA's. The cap-type pen's length is from our guide's reading of MUJI USA's page. ## Gel ink or oil ink: which MUJI pen? **Choose gel for a wet, saturated line and oil ink for a drier, longer-lasting ballpoint.** MUJI USA calls its gel ink aqueous and quick-drying; it calls the oil ink on the Smooth Oil Ink pen quick-drying too. That is a maker claim for both. For the difference in general, see our [gel vs ballpoint vs rollerball](https://stationerytimes.com/guides/gel-vs-ballpoint-vs-rollerball/) guide and our [best gel pens](https://stationerytimes.com/guides/best-gel-pens/) roundup. ## Which MUJI pens are refillable? **The gel knock and cap-type pens are, and MUJI sells refills singly.** MUJI Japan says one refill fits both the cap and knock bodies, and MUJI USA sells 0.5 mm and 0.3 mm smooth gel refills. The oil ink pens have refills too, and MUJI USA says the smooth oil ink refills are interchangeable between bodies. The compact pens' listings don't mention refills, and the compact fountain pen takes only compact cartridges. ## Where are these MUJI pens made? **The full-size pens are made in Japan and the compact pens in China, per MUJI USA.** MUJI is the brand of Ryohin Keikaku, a Japanese retailer. See our [best pocket pens](https://stationerytimes.com/guides/best-pocket-pens/) and [best Japanese pens](https://stationerytimes.com/guides/best-japanese-pens/) roundups for other makers. ## Frequently asked questions ### Which MUJI pen is the most popular? MUJI USA tags the Gel Ink Knock Pen 0.5 mm, the cap-type gel pens and the Smooth Gel Knock 0.3 mm as best sellers in its stationery range. MUJI publishes no sales figures, so that is a retailer label, not a ranking. ### What is the finest MUJI gel pen? The Smooth Gel Ink Ballpoint Knock Pen at 0.3 mm, per MUJI USA. The cap-type pen comes next at 0.38 mm. ### Are MUJI pens refillable? MUJI USA says its gel knock pens can be refilled and sells refills singly. Its compact pens' listings do not mention refills, and the compact fountain pen takes only MUJI's compact cartridges. ### Where are MUJI pens made? The full-size gel and oil ink pens we cover list Japan as the country of origin; the compact gel and fountain pens list China. ### Is MUJI gel ink waterproof? MUJI USA calls the gel ink aqueous (water-based) and quick-drying, which does not mean waterproof. Only the oil ink polycarbonate ballpoint is described as withstanding a light wash. ### What is the best MUJI pen for left-handed writers? MUJI USA says the quick-drying gel ink on its knock and compact gel pens suits left- and right-handed writers. We haven't smear-tested them, so treat that as a maker claim. ### How much do MUJI pens cost? MUJI USA lists the single gel and oil ink pens at US$2.40 to US$2.90 each, which is our $ band, and the compact fountain pen at US$18.90 ($$). Prices change; we read them on November 1, 2026. ### Do MUJI pens come in sets? Yes. MUJI USA sells 10-pen sets of its cap-type and knock gel pens, and the sets cost less per pen than single pens. ## Sources - [MUJI USA: Gel Ink Ballpoint Pen Knock Type 0.5mm (14.5 cm, 16 colors, Japan; read November 1, 2026)](https://www.muji.us/products/gel-ink-ballpoint-pen-knock-type-0-5mm) - [MUJI USA: Smooth Gel Ink Ballpoint Knock Pen 0.3 mm (14.5 cm, five colors, Japan)](https://www.muji.us/products/smooth-gel-ink-knock-type-ballpoint-pen-0-3mm) - [MUJI USA: Gel Ink Ballpoint Cap Type Pen 0.38 mm (14 cm, Japan)](https://www.muji.us/products/gel-ink-cap-type-pen-0-38mm) - [MUJI USA: Smooth Oil Ink Ballpoint Pen 0.5 mm (14.1 cm, Japan)](https://www.muji.us/products/smooth-oil-ink-ballpoint-pen-0-5-mm-black-nbe04a3a) - [MUJI USA: Oil Ink Polycarbonate Ballpoint Pen 0.7mm (14.0 cm long, 1.5 cm across, Japan)](https://www.muji.us/products/oil-ink-polycarbonate-ballpoint-pen-0-7mm-s444) - [MUJI USA: Compact Gel Ink Ballpoint Pen Cap Type 0.5mm (11 cm, China)](https://www.muji.us/products/compact-gel-ink-ballpoint-pen-cap-type-0-5mm-black) - [MUJI USA: Compact Fountain Pen (11 cm, 0.5 mm, China)](https://www.muji.us/products/compact-fountain-pen-nbf4cc4s) - [MUJI USA stationery collection (product list and best-seller tags, read November 1, 2026)](https://www.muji.us/collections/stationery)