--- title: "Tombow MONO Twin: Two-Tip Oil Marker, 0.8 and 0.4 mm" canonical: "https://stationerytimes.com/guides/tombow-mono-twin-marker/" description: "Tombow MONO Twin explained: a double-ended oil-based dye marker with 0.8 and 0.4 mm lines for paper, metal, plastic, glass, leather and wood, 165 yen." category: "Accessories" type: "Permanent marker" published: 2026-11-02 updated: 2026-11-02 author: "Ellis Penhale" publisher: "Stationery Times" sources: 1 products: - name: "Tombow MONO Twin double-ended marker (OS-TME33, OS-TME25, OS-TME15)" brand: "Tombow" brand_origin: "Japan" made_in: "Not stated" material: "Plastic body with at least 70% recycled plastic by weight excluding the ink (Tombow)" price_band: "$ (under $5 per item, typical US retail, October 2026)" manufacturer: "Tombow Pencil Co., Ltd. (Tokyo)" model: "MONO Twin" mpn: "OS-TME33" url: "https://www.tombow.com/products/mono_twin/" --- # Tombow MONO Twin: Two-Tip Oil Marker, 0.8 and 0.4 mm > The Tombow MONO Twin is a double-ended oil-based marker with a 0.8 mm tip at one end and a 0.4 mm tip at the other. Its dye ink writes on paper, metal, plastic, glass, plastic bags, ceramics, leather and wood. It comes in black, red and blue and costs 165 yen with tax (about US$1.04) in Japan. - URL: https://stationerytimes.com/guides/tombow-mono-twin-marker/ - Category: Accessories - Author: Ellis Penhale - Published: 2026-11-02 - Updated: 2026-11-02 ![Tombow MONO Twin black double-ended marker with a fine cap at each end and a pocket clip](https://stationerytimes.com/images/raster/tombow-mono-twin-marker-illustration-16x9.png?v=69e42993) *The MONO Twin in black, drawn in proportion (Tombow lists no size); circle: the two line widths at 1 mm = 40 px.* 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) | |---|---|---|---|---|---|---| | Tombow MONO Twin double-ended marker (OS-TME33, OS-TME25, OS-TME15) | Tombow (by Tombow Pencil Co., Ltd. (Tokyo)) | Japan | Not stated | Plastic body with at least 70% recycled plastic by weight excluding the ink (Tombow) | – | $: under $5 per item | - Made in (Tombow MONO Twin double-ended marker (OS-TME33, OS-TME25, OS-TME15)): Not stated. Tombow's Japanese product page lists colors, model numbers and prices but no country of manufacture, so check the label on your copy. ### Tombow MONO Twin double-ended marker (OS-TME33, OS-TME25, OS-TME15) colors - Ink colors (3 standard, 0 special edition): Black; Red; Blue. - Per Tombow (Japan) (https://www.tombow.com/products/mono_twin/), checked 2026-11-02. Tombow sells three inks: black (OS-TME33), red (OS-TME25) and blue (OS-TME15). Tints were sampled from Tombow's product images and are representative, not measured. Shops stock different colors; check the listing. ## Key takeaways - Each marker has two tips: a 0.8 mm line at one end and a 0.4 mm line at the other, per Tombow. - The oil-based dye ink writes on paper, metal, plastic, glass, plastic bags, ceramics, leather and wood. - Tombow sells black (OS-TME33), red (OS-TME25) and blue (OS-TME15) at 165 yen with tax each (about US$1.04). - The body uses at least 70% recycled plastic by weight excluding the ink, with the Eco Mark, Tombow says. - Tombow warns that a dropped or knocked marker can leak and that it needs ventilation in long use. ## What is the Tombow MONO Twin? **It is a general-purpose double-ended marker.** Tombow describes it as a twin-type oil-based marker with fine and extra-fine tips, built for a wide range of uses: one pen for paper, metal, plastic, glass and more. The page calls it an oil-based dye ink. For other permanent markers see our [best permanent markers](https://stationerytimes.com/guides/best-permanent-markers/) roundup. We read Tombow's Japanese page on November 2, 2026. ## What can it write on? **More than paper.** Tombow says its oil-based dye ink writes on paper and also on metal, plastic, glass, plastic bags, ceramics, leather and wood. It does not say how well the ink resists water, rubbing or sunlight on any of those, so check on your own material before using it for anything lasting. ## What are the tip sizes? **0.8 mm and 0.4 mm.** The twin design lets you switch by turning the pen over. The page labels the ends "fine" (0.8 mm) and "extra fine" (0.4 mm) and lists the line widths as 0.8 mm and 0.4 mm. For a brush-tip Tombow pen see our [Fudenosuke guide](https://stationerytimes.com/guides/tombow-fudenosuke/). ## Which colors and models are sold? **Black, red and blue.** | Color | Model | Price with tax | |---|---|---| | Black | OS-TME33 | 165 yen (about US$1.04) | | Red | OS-TME25 | 165 yen (about US$1.04) | | Blue | OS-TME15 | 165 yen (about US$1.04) | Tombow's page lists no refill or replacement tip, so we treat it as a disposable pen. ## Who is the MONO Twin for? **It suits people who label mixed materials and want both a fine and an extra-fine line in one pen.** The facts behind that are the two tip widths, the surfaces Tombow lists and the 165 yen price (about US$1.04). It is a poor pick for anything that must survive water or sun, since Tombow makes no such claim. ## How is the body made? **Partly, per Tombow.** The page lists it as a Green Tombow product with at least 70% recycled plastic by weight in the product excluding the ink, the Eco Mark (number 15112023), Japan's Green Purchasing Law compliance with at least 40% recycled plastic and a GPN eco-products listing. ## What should you watch out for? **Cap it, ventilate and keep it from fire.** Tombow says to put the cap on after use, that a drop or hard knock can cause ink to leak, to ventilate well during long use, to keep it away from flames, to keep it from small children and to use it only for writing and drawing. ## How do you choose between the two tips? **Use 0.4 mm for small labels and 0.8 mm for bolder marks.** Tombow gives only the two widths, so the choice is yours: the extra-fine end suits a name on a small tag or a narrow label, and the 0.8 mm end suits writing that has to read from a distance. Because the ink is oil-based dye, test it on the surface you plan to mark, and mark a hidden corner first on glossy plastic or leather. ## Where is it made, and what does it cost? **Tombow's page doesn't state a country of manufacture.** At 165 yen with tax (about US$1.04), it is in our $ band (under $5). For a cloth-focused twin marker from the same maker, see the [Tombow Namae Senka](https://stationerytimes.com/guides/tombow-namae-senka-name-marker/). ## Frequently asked questions ### What line widths does it draw? 0.8 mm with the thicker tip and 0.4 mm with the finer tip, per Tombow. ### What surfaces can I write on? Tombow lists paper, metal, plastic, glass, plastic bags, ceramics, leather and wood. ### What colors are sold? Black, red and blue, each 165 yen with tax (about US$1.04). ### Is the ink permanent or waterproof? Tombow calls it oil-based dye ink but makes no claim about permanence or water resistance. Test it on your surface. ### Is it refillable? Tombow's page lists no refill or replacement tip, so treat it as disposable. ### Is the body recycled? Tombow says at least 70% of the plastic by weight, excluding the ink, is recycled, with the Eco Mark, Green Purchasing Law compliance and a GPN listing. ### What should I watch out for? Cap it after use, avoid drops that can leak ink, ventilate during long use and keep it away from fire. ### Where is it made? Tombow's page doesn't say; check the label on your copy. ## Sources - [Tombow (Japanese): MONO Twin oil-based marking pen product page (line widths, surfaces, colors, model numbers, price, eco certification, cautions; read November 2, 2026)](https://www.tombow.com/products/mono_twin/)