Home Guides Pens Gel pens MUJI Smooth Gel Ink Knock Pen 0.3 mm: Colors & Refills Brand: MUJI
MUJI Smooth Gel Ink Knock Pen 0.3 mm: Colors & Refills Compiled from 3 sources; we haven't tested this product ourselves yet. How we research
Quick answer The MUJI Smooth Gel Ink Ballpoint Knock Pen is a retractable 0.3 mm gel pen with a clear frosted body and a clip. MUJI USA sells it in five colors, lists it at 14.5 cm (5.7 in), says its aqueous ink dries quickly, and gives Japan as the country of origin.
The knock pen at MUJI USA's listed 14.5 cm, with the 0.3 mm ball shown 60 times larger. Original illustration made for this guide. © Stationery Times. Product facts Product 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) 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 all five colors. 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 pen at 5.7 in (14.5 cm) long with a 0.3 mm nib and a clip, in a clear frosted body. Five colors in the US: black, blue, red, blue black and orange. The body is polycarbonate, ABS resin, steel and polypropylene, and the ink is aqueous (water-based) gel with a 0.3 mm tip. MUJI says the ink is quick-drying and suits left- and right-handed writers; those are maker claims, not our tests, and the pen is 5 mm longer than MUJI's 14 cm cap-type pen. MUJI USA gives Japan as the country of origin, and each pen is in our $ band (under $5). What is the MUJI Smooth Gel Ink Ballpoint Knock Pen?
It’s MUJI’s retractable gel pen with a 0.3 mm tip, a clip and a clear frosted body. MUJI is the brand of Ryohin Keikaku, the Japanese retailer. MUJI USA tags the pen as a best seller in its stationery range.
MUJI USA says the water-based ink dries quickly, resists bleeding through paper, and has a built-in mechanism that stops the ink drying out or flowing the wrong way. Those are the maker’s claims. It also says the frosted body shows how much ink is left.
MUJI smooth gel knock pen specs
Spec
Value
Maker
MUJI (Ryohin Keikaku Co., Ltd.), Japan
Type
Retractable gel pen with clip, refillable
Length
5.7 in (14.5 cm), per MUJI USA
Nib
0.3 mm
Ink
Aqueous (water-based) gel
Materials
Polycarbonate, ABS resin, steel, polypropylene
Colors (US)
Black, blue, red, blue black, orange
Barcode (black)
4550344872703
Made in
Japan (MUJI USA)
MUJI USA gives no weight, barrel width or refill length for this pen, so the barrel in our drawing is drawn by eye.
Who is the MUJI smooth gel knock pen for?
It suits anyone who wants a very fine, quick-drying line in a pen that clips to a notebook.
Left-handed writers: MUJI USA calls the ink quick-drying and suitable for left- and right-handed writers, at a 0.3 mm nib.Everyday carry: it is 145 mm (5.7 in) long and the clip fits a pocket, lanyard or closed notebook.
Skip it if you want a broad line: 0.3 mm is the finest of MUJI’s gel sizes.
Nominal widths at 20×: the 0.3 mm line is 0.08 mm finer than the 0.38 mm cap-type pen. Original illustration made for this guide. © Stationery Times.
Is the 0.3 mm knock pen the same as MUJI’s cap-type gel pen?
No. It’s a separate, finer line with a retractable mechanism. The MUJI gel ink pen is the capped pen in 0.38, 0.5 and 0.7 mm; this knock pen is a single 0.3 mm size.
MUJI USA lists the cap-type pen at 14 cm, so the knock pen is 5 mm longer. For a standard 0.5 mm line, see the MUJI Gel Ink Ballpoint Knock Pen 0.5 mm . MUJI says its cap and knock bodies share refills in Japan; for this specific 0.3 mm pen, MUJI USA doesn’t name a refill, so we haven’t confirmed one.
Which MUJI knock pen color should you choose?
Pick by job: black or blue black for notes, red and orange for marks and corrections. MUJI USA sells all five colors at the same price. We don’t publish swatches because MUJI USA’s page gives no ink tints we could state honestly.
How does it compare with the Pilot G2 and Zebra Sarasa Clip?
It’s the finest and the plainest: the Pilot G2 and Zebra Sarasa Clip offer more sizes and are sold in more US stores.
MUJI Smooth Gel Knock
Pilot G2
Zebra Sarasa Clip
Mechanism
Click
Click
Click
Sizes
0.3 mm only
0.38 / 0.5 / 0.7 / 1.0 mm
0.3 / 0.4 / 0.5 / 0.7 / 1.0 mm
Body
Clear frosted, with clip
Clear plastic, rubber grip
Plastic, movable binder clip
Where to buy
MUJI stores and muji.us
Most US stores
Most US stores
Price band
$
$
$
Our best gel pens roundup picks one gel pen per job, and the left-handed writers roundup covers smear-resistant picks.
How much does it cost?
Each pen is in our $ band, under $5. MUJI USA lists every color at the same single-pen price. The product page was read on November 1, 2026, and prices change.
Where is the MUJI smooth gel ink knock pen made?
In Japan: MUJI USA’s product details give Japan as the country or region of origin. MUJI doesn’t name the factory.
Frequently asked questions Is the MUJI 0.3 mm knock pen good for left-handed writers? MUJI USA says the quick-drying ink works whether you write left- or right-handed, and tags the pen for left-handers. We haven't smear-tested it ourselves yet, so treat that as the maker's claim.
Does the MUJI smooth gel pen have a clip? Yes. MUJI USA says the clip lets you store the pen in a pocket, on a lanyard or in a closed notebook.
Can you refill the MUJI smooth gel ink pen? MUJI USA says yes: when the ink runs out the pen can be refilled. It doesn't name the refill on this page, so check that a refill for the 0.3 mm line is in stock before you buy a stack of pens.
What colors does the MUJI 0.3 mm knock pen come in? MUJI USA lists black, blue, red, blue black and orange.
Is the MUJI 0.3 mm pen finer than the MUJI 0.38 mm? Yes, by 0.08 mm on paper: 0.3 mm against 0.38 mm. The 0.38 mm is MUJI's cap-type gel pen, covered in our MUJI gel ink pen guide.
Does the MUJI gel pen carry a California warning? MUJI USA's page carries a California Proposition 65 warning that names cancer. The page doesn't say which part of the pen triggers it.
Can I return a MUJI pen bought online? MUJI USA marks this pen 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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