Home Guides Pens Ballpoint pens MUJI Smooth Oil Ink Ballpoint Pen: 0.38, 0.5, 0.7 mm Brand: MUJI
MUJI Smooth Oil Ink Ballpoint Pen: 0.38, 0.5, 0.7 mm Compiled from 3 sources; we haven't tested this product ourselves yet. How we research
Quick answer The MUJI Smooth Oil Ink Ballpoint Pen is a quick-drying oil-ink ballpoint with a grip that runs to the tip. MUJI USA lists the 0.5 mm at 14.1 cm (5.6 in), sells it in 0.38, 0.5 and 0.7 mm, says refills are interchangeable between single-color and multi-color bodies, and gives Japan as the origin.
The 0.5 mm pen at MUJI USA's listed 14.1 cm (1 mm = 6.2 px). Original illustration made for this guide. © Stationery Times. Product facts Product 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) Good for Price range $ under $5 per pen (multi-packs divided by the count) Rate it ★ ★ ★ ★ ★ No ratings yet. Be the first to rate this product. Notes on these facts Made by Ryohin Keikaku Co., Ltd.. Made in Japan: MUJI USA's product details give "Country/Region of Origin: Japan" for the 0.5 mm black pen. Source . Price: example listing . How we test and disclose samples: How we test stationery . Price bands are typical US retail, checked October 2026. Key takeaways MUJI USA lists the 0.5 mm pen at 5.6 in (14.1 cm) long; the 0.38, 0.5 and 0.7 mm sizes come in black, red and blue. MUJI says the oil ink is quick-drying and the grip extends all the way to the tip. The tip is polypropylene with thermoplastic elastomer and the shaft is ABS resin. MUJI says the refills are interchangeable, so single-color, four-color and three-color-plus-pencil bodies share them. MUJI USA gives Japan as the origin, and each single pen is in our $ band (under $5). What is the MUJI Smooth Oil Ink Ballpoint Pen?
It’s a quick-drying oil-ink ballpoint with a rubber-like grip that runs all the way to the tip, in three ball sizes. MUJI is the brand of Ryohin Keikaku, the Japanese retailer. MUJI USA says the pen gives an ultra-smooth writing experience; that is the maker’s claim.
The same family includes four-color bodies and three-color bodies with a mechanical pencil, all in the same sizes.
MUJI smooth oil ink pen specs
Spec
Value
Maker
MUJI (Ryohin Keikaku Co., Ltd.), Japan
Type
Ballpoint pen, refillable
Length (0.5 mm black)
5.6 in (14.1 cm)
Ball sizes
0.38, 0.5, 0.7 mm
Ink
Oil-based, quick drying
Materials
Tip: polypropylene, thermoplastic elastomer; shaft: ABS resin
Colors (single pens)
Black, red, blue
Barcode (0.5 mm black)
4550583768157
Made in
Japan (MUJI USA)
MUJI USA gives no weight or barrel width, so the barrel in our drawing is drawn by eye.
Who is the MUJI smooth oil ink pen for?
It suits people who want a smooth ballpoint with a grip and the freedom to mix refills.
Everyday writing: MUJI USA says the quick-drying oil ink and interchangeable refills suit everyday use, in our $ band.Note-taking: it writes a 0.5 mm line with quick-drying oil ink, and a 0.38 mm size is also sold.
Skip it if you write while lying down: MUJI warns against using the pen with its tip pointing upwards.
The three ball sizes MUJI USA lists (nominal widths at 20×). Original illustration made for this guide. © Stationery Times.
Which ball size should you choose?
Choose 0.38 mm for small notes in planners, 0.5 mm for everyday writing, and 0.7 mm for a bolder line. The three sizes are the ones MUJI USA lists; the figure above shows their nominal widths. The same three sizes exist in MUJI’s cap-type gel pen , which uses gel ink.
How do the interchangeable refills work?
MUJI says the refills can be freely combined across its single-color, four-color and three-color-plus-pencil bodies. In the US it sells the three-color-plus-pencil pens in 0.38, 0.5 and 0.7 mm, and four-color pens in the same sizes. MUJI USA also sells refills singly in green, blue and other colors.
How does it compare with MUJI’s other ballpoints?
It’s the grippy, multi-size choice; the oil ink polycarbonate pen is a thick, plain 0.7 mm pen.
Smooth Oil Ink
Oil Ink Polycarbonate
Length
14.1 cm (5.6 in), 0.5 mm
14.0 cm (5.5 in)
Ball sizes
0.38 / 0.5 / 0.7 mm
0.7 mm
Grip
To the tip
Plain barrel
Made in
Japan
Japan
See our best ballpoint pens for ballpoints from other brands.
Where is it made, and what does it cost?
In Japan: MUJI USA gives Japan as the country or region of origin. Each single pen is in our $ band, under $5. MUJI USA sells it as Final Sale, with no refunds or exchanges; we read the page on November 1, 2026, and prices change.
Frequently asked questions What sizes does the MUJI smooth oil ink pen come in? MUJI USA lists 0.38, 0.5 and 0.7 mm in black, red and blue, plus four-color and three-color-with-pencil versions.
Can you combine MUJI smooth oil ink refills in one body? MUJI USA says the refills are interchangeable, so single-color, four-color and three-color-plus-mechanical-pencil options can be freely combined.
Does the MUJI smooth oil ink pen have a grip? Yes. MUJI USA says the grip at the bottom of the pen extends all the way to the tip so the pen doesn't slip.
Can you write upside down with the MUJI oil ink pen? MUJI USA's care notes say not to use the pen with its tip pointing upwards, for example when writing on a wall calendar or lying down.
Is the MUJI smooth oil ink pen made in Japan? Yes. MUJI USA lists Japan as the country or region of origin.
Is the MUJI 0.38 mm oil ink pen finer than the gel pen? The ball is the same nominal size as MUJI's 0.38 mm cap-type gel pen. Oil ink and gel ink lay down lines differently, so we can't say which looks finer until we test them.
Can I return a MUJI pen bought online? MUJI USA marks it Final Sale, with no refunds or exchanges, on its product page as we read it.
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Style Fit: Build-Your-Own Multi Pen and Refills Price range: $$Pilot Falcon: Soft 14k Nib, Elabo Roots & Sizes Price range: $$$$Sailor Pro Gear Slim: Gold Nib, Sizes & 21k Update Price range: $$$$TWSBI GO: Spring Piston, 1.61 ml & Nib Sizes Price range: $$$Pentel Touch Sign Pen: Brush Tip, Colors & Line Width Price range: $Monami 153: Korea's Hexagonal Ballpoint Since 1963 Price range: $Monami Olika: Korea's Budget Cartridge Fountain Pen Price range: $$Caran d'Ache 849: The Swiss Hexagonal Ballpoint Price range: $$$STAEDTLER triplus fineliner: 0.3 mm Triangle Pens Price range: $Pelikan M200: Piston Filler, Steel Nib & M205 Price range: $$$$Pilot Prera: Compact Size, CON-40 & Demonstrators Price range: $$$Pentel Pocket Brush Pen: Bristles, Ink & Refills Price range: $$Tombow Fudenosuke: Hard vs Soft Tip Brush Pens Price range: $Parker Jotter Pen: Refills, Sizes and History Since 1954 Price range: $$$Pilot Custom 74: 14k Gold Nib, CON-70 & Sizes Price range: $$$$Platinum #3776 Century: Slip & Seal Cap & Gold Nib Price range: $$$$Pentel R.S.V.P.: Fine vs Medium, Refills & Grip Price range: $Zebra F-301: Steel Barrel, Point Sizes & Refills Price range: $Sakura Gelly Roll: White Gel Pen Sizes & Moonlight Inks Price range: $Kaweco Sport: Pocket Size, Cartridges & Nib Sizes Price range: $$$LAMY 2000: Piston Filler, Hooded Nib & Makrolon Price range: $$$$Pilot Vanishing Point: Retractable Nib & Converter Price range: $$$$uni-ball One: Pigment Gel Ink, Sizes & Refills Price range: $uni-ball Signo 207: Fraud-Resistant Gel Pen Guide Price range: $Pentel Sign Pen: The 1963 Fiber-Tip Pen Explained Price range: $Platinum Preppy: The Slip & Seal Starter Fountain Pen Price range: $$Zebra Sarasa Clip: The Binder-Clip Gel Pen Explained Price range: $Pilot Precise V5: Liquid Ink, Needle Tip & V5 RT Price range: $Zebra Mildliner: Mild Colors, Twin Tips & Ink Price range: $Pilot Metropolitan: Nibs, Converters & Brass Body Price range: $$$uni-ball Jetstream RT: Hybrid Ink, Tip Sizes & Refills Price range: $Pentel EnerGel RTX: Liquid Gel Ink, Tips & Refills Price range: $Sharpie S-Gel Pen Sizes: 0.38–1.0 mm, Refills & Smear Claims Price range: $ARTISTRO Dual-Tip Acrylic Paint Markers: Tips and Sets Price range: $Caliart Alcohol Markers: 41-Color Chisel and Fine Set Price range: $Ohuhu Oahu: Chisel-and-Fine Alcohol Markers Price range: $Copic Ciao: 180 Colors, Round Body & Refills Explained Price range: $Prismacolor Premier Double-Ended Markers: Tips & Sets Price range: $Sharpie Clear View Highlighter: See-Through Chisel Tip Price range: $Asvine P100: Titanium Piston Pen With a #8 Nib Price range: $$$Asvine V800: Vacuum Filler With a Large #8 Nib Price range: $$$Best Dip Pens for Beginners: Nikko G, Zebra G & Holders Price range: $–$$$Best Markers & Pens for Manga: Copic, Multiliner, G Nibs Price range: $–$$Best Pens & Markers for Coloring: Brush Pens to Alcohol Price range: $–$$Best Pens for Nurses: Click Pens That Survive a Shift Price range: $–$$$Best Pens for Teachers: Grading, Marking & Worksheets Price range: $–$$Paper Mate EraserMate: Erasable Ballpoint Explained Price range: $Best Fine-Tip Pens for Small Handwriting (2026) Price range: $–$$Best Fountain Pens Under $200 (2026): What US$200 Buys Price range: $$$–$$$$Best Fountain Pens Under $50 (2026): Kakuno to ECO Price range: $–$$$Best Multi Pens (2026): Jetstream 4&1, Coleto & More Price range: $–$$Best Pens That Don't Smudge (2026): Fast-Drying Picks Price range: $–$$Best Rollerball Pens (2026): Vision Elite, V5 & More Price range: $–$$$Best Japanese Highlighters: Mildliner, Propus & More Price range: $Best New Japanese Pens of 2026: FriXion Synergy 3 & More Price range: $–$$$$Best Paint Markers: POSCA vs Sharpie Creative vs MOLOTOW Price range: $Visconti Homo Sapiens vs Mirage Mythos: Lava or Resin Price range: $$$$Monami Rein Fountain Pen: EF Nib, Cartridges, Size Price range: $$$BENU Euphoria: Tea, Coffee and Cocktail Fountain Pens Price range: $$$$MOLOTOW ONE4ALL 127HS: Refillable Acrylic Marker Price range: $Ohuhu Maui: Water-Based Dual Brush Markers Price range: $Sakura Koi Coloring Brush Pen: Nylon Tip, 48 Colors Price range: $Best Erasable Pens: FriXion, Synergy & EraserMate Price range: $Pilot G2 vs Zebra Sarasa Clip: Sizes, Ink & Refills Price range: $Pilot Metropolitan vs LAMY safari: Nibs, Weight & Ink Price range: $$$TWSBI ECO vs LAMY safari: Piston vs Cartridge Filling Price range: $$$Ohuhu Honolulu: Brush-and-Chisel Alcohol Markers Price range: $Paper Mate Profile: The 1.4 mm Bold Retractable Pen Price range: $Pen Refills Explained: Formats, Codes and Swaps Price range: $–$$$Sustainable Pens vs Disposable: What Really Helps Price range: $–$$$Discontinued Pens People Still Want (2027 List) Price range: $–$$Zebra Sarasa Dry X20: Quick-Dry Gel Pen for Lefties Price range: $Best Gifts for Fountain Pen Lovers (2027): 9 Picks Price range: $$–$$$$Fountain Pen vs Gel Pen: Feel, Line, Paper and Cost Price range: $–$$$Japanese vs Western Nib Sizes: Why a Japanese F Is Finer Price range: $$$–$$$$Best Calligraphy Pens for Beginners (2027): 6 Picks Price range: $–$$$Sharpie Pen Fine Point: The 0.4 mm Felt Tip Pen Price range: $Best Alcohol Markers (2027): Ohuhu vs Copic and More Price range: $–$$Pilot G2 vs uni-ball Signo 207: Ink, Sizes & Refills Price range: $Copic Sketch: Nibs, 358 Colors & Refillable Ink Price range: $$uni POSCA PC-5M: Opaque Paint Marker Guide Price range: $Fountain Pen Nib Sizes Explained: EF, F, M and B Price range: $$$–$$$$Gel vs Ballpoint vs Rollerball: How the Inks Differ Price range: $Best Pens for Note-Taking (2027): 7 Picks by Use Price range: $–$$Best Luxury Pens (2027): 10 Gift & Heirloom Picks Price range: $$$–$$$$Best Fineliner Pens: Micron, Point 88 & More Price range: $Best Vintage Fountain Pens to Buy (2027): 9 Classics Price range: $$$$Best Ballpoint Pen: Jetstream RT Wins, 12 Picks Compared Price range: $–$$$Best Brush Pens: Fudenosuke, ABT & Pocket Brush Price range: $–$$Monami Plus Pen 3000: Korea's 0.4 mm Felt Tip Pen Price range: $Kuretake ZIG Clean Color Real Brush: Colors & Blending Price range: $Faber-Castell PITT Artist Pen: Brush Tips & India Ink Price range: $Stabilo Point 88: Fineliner Colors, Tip & Dry-Out Price range: $Paper Mate InkJoy Gel: Sizes, Dry Time & Color Packs Price range: $Best Gel Pens: G2, EnerGel, Sarasa & More Price range: $Paper Mate Flair: Felt Tip Sizes & Point Guard Price range: $All pens guides →
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