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Best Japanese Erasers: MONO, Radar, Dust Catch & More

By · Published · 7 min read

Compiled from 8 sources; we haven't tested these products ourselves yet. How we research

Quick answer

The Tombow MONO PE-04A is the best Japanese eraser for most people: a 55 × 23 × 11 mm phthalate-free plastic block sold since 1969. Pick the Seed Radar for a close rival, the MONO Dust Catch to keep crumbs together, the MONO Zero for single letters, the MONO Knock for a click-out stick and the MONO Sand for ink.

On this page11 sections
Seven Japanese erasers labelled with their pick: MONO Zero and MONO Knock pens above five block erasers, MONO, Radar, Dust Catch, MONO Sand and SumoGrip
One eraser per job; the blocks and the MONO Zero are drawn to scale at 1 mm = 2.2 px, the MONO Knock in proportion.

Products compared

  1. White Tombow MONO PE-04A eraser in its striped sleeve beside a cleanly erased pencil lineNo. 1Tombow MONO eraser, PE-04A$Read the guide →
  2. White Seed Radar SR-100 eraser in its blue sleeve, drawn to scale at 55 mm long, with a close-up of the sleeve's cut-off cornerNo. 2Seed Radar plastic eraser, SR-100$Read the guide →
  3. Black Tombow MONO Dust Catch eraser drawn to scale at 55 mm, with a strand of crumbs clinging to itNo. 3Tombow MONO Dust Catch eraser$Read the guide →
  4. Silver Tombow MONO Zero round eraser beside handwriting with one letter erased, with its 2.3 mm tip insetNo. 4Tombow MONO Zero eraser, round 2.3 mm tip$$Read the guide →
  5. Tombow MONO Knock eraser in blue with MONO stripes, a clip and a rubber grip, with an inset of its 3.8 mm round eraser tipNo. 5Tombow MONO Knock eraser, Blue$Read the guide →
  6. Grey Tombow MONO Sand eraser in its MONO sleeve, drawn to scale at 67 mm, beside blue ballpoint lines with a gap erasedNo. 6Tombow MONO Sand eraser$Read the guide →
  7. Black Sakura SumoGrip B80 eraser in its sleeve, drawn to scale at 54 mm long, with a close-up of crumbs rolling into strandsNo. 7Sakura SumoGrip block eraser, B80$Read the guide →
ProductBrand originMade inPrice range
Tombow MONO eraser, PE-04ATombowJapanJapan*Price range: $under $5 per item
Seed Radar plastic eraser, SR-100 (EP-SR-100)SeedJapanNot stated*Price range: $under $5 per item
Tombow MONO Dust Catch eraser (EN-DC; US 57334)TombowJapanJapan*Price range: $under $5 per item
Tombow MONO Zero eraser, round 2.3 mm tip (57305 / EH-KUR)TombowJapanJapan*Price range: $$$5–20 per item
Tombow MONO Knock eraser, Blue (EH-KE)TombowJapanNot stated*Price range: $under $5 per item
Tombow MONO Sand eraser (US 57304; Japan ES-512B)TombowJapanNot stated*Price range: $under $5 per item
Sakura SumoGrip block eraser, B80 (3-pack, 50258)SakuraJapanNot stated*Price range: $under $5 per item
Notes on these facts
  • Tombow MONO eraser, PE-04A: Made by Tombow Pencil Co., Ltd.. Made in Japan: Officeworks in Australia lists Japan as the country of manufacture for the PE-04A, and Galaxus gives Japan as the country of origin. But St. Louis Art Supply, a US shop, says its PE-04A is made in Vietnam, so US stock may differ. Tombow's Japanese MONO page (read on October 21, 2026) doesn't state a country; check the packaging. Source. Released: Tombow says the MONO eraser was created as a giveaway with the MONO 100 pencil (launched 1967) and became a product in 1969; that is the line's launch year, not necessarily the PE-04A code's.
  • Seed Radar plastic eraser, SR-100 (EP-SR-100): Made by Seed Co., Ltd. (Toyonaka, Osaka). Country of manufacture not stated: Seed's Japanese product and company pages (read in full on October 22, 2026) don't say where the Radar is made. Seed lists a head-office factory in Toyonaka, Osaka, and a subsidiary, SEED VIETNAM CO., LTD., in Hanoi, so the factory isn't certain. Check the sleeve. Released: Seed says the Radar went on sale in 1968; the current SR codes replaced older ones such as the S-100 still sold on Amazon.
  • Tombow MONO Dust Catch eraser (EN-DC; US 57334): Made by Tombow Pencil Co., Ltd.. Made in Japan: Galaxus listings for the EN-DC give Japan as the country of origin (seen in search results; the page blocks automated reading). Tombow's own pages don't state a country, so check the sleeve. Source.
  • Tombow MONO Zero eraser, round 2.3 mm tip (57305 / EH-KUR): Made by Tombow Pencil Co., Ltd.. Made in Japan: STL Art Supply says the MONO Zero 2.3 mm eraser is made in Japan, and Officeworks in Australia lists Japan as the country of manufacture for its black round MONO Zero. Tombow's Japanese page doesn't state a country, and we found no reliable origin for the ER-KUR refills. Source.
  • Tombow MONO Knock eraser, Blue (EH-KE): Made by Tombow Pencil Co., Ltd. (Tokyo); sold in the US by Tombow USA. Country of manufacture not stated: Tombow USA's product page and the Amazon US listing don't state a country of manufacture, and Tombow's Japanese site no longer has a product page for the MONO Knock. Check the package. Source. Released: GetNavi's 2025 overview of Tombow's MONO line gives November 1995 for the MONO Knock 3.8; Tombow's own pages we found don't give a date.
  • Tombow MONO Sand eraser (US 57304; Japan ES-512B): Made by Tombow Pencil Co., Ltd.. Country of manufacture not stated: Tombow's Japanese and US pages don't state a country of manufacture, and the Amazon US listing for the 2-pack doesn't either, so check the sleeve.
  • Sakura SumoGrip block eraser, B80 (3-pack, 50258): Made by Sakura Color Products Corporation (Osaka); sold in the US by Sakura of America. Country of manufacture not stated: Sakura of America's SumoGrip Eraser page (read in full on October 22, 2026), JetPens and Amazon US don't state a country of manufacture. Sakura's Japanese site doesn't list the SumoGrip at all. Check the package.
  • Price bands are typical US retail, checked October 2026. Conversions to US dollars are approximate, at October 2026 rates (US$1 = ¥158 = ₩1,330 = NT$32.5 = CN¥6.7 = SEK 9.9 = DKK 6.7 = ₺49.6 = C$1.41 = A$1.43 = CZK 21.7; €1 = US$1.12; £1 = US$1.32; CHF 1 = US$1.21).

Key takeaways

  • The MONO PE-04A, Seed Radar SR-100 and MONO Dust Catch are all 55 mm (2.2 in) blocks, and each costs ¥110 (about US$0.70) to ¥154 (about US$1.00) in Japan.
  • Seed says the Radar scored a 97% erasure rate in the Japan Eraser Manufacturers Association's test; Seed has sold it since 1968, Tombow the MONO since 1969.
  • The MONO Zero's round tip is 2.3 mm across, and the MONO Knock's stick is 3.8 mm, per Tombow.
  • The MONO Sand, 67 × 16 × 8 mm, removes ballpoint ink and colored pencil by abrading a thin layer of paper, per Tombow Japan.
  • Item 57334, the MONO Dust Catch, had 4.7 stars from 1,966 Amazon US ratings on October 22, 2026.

What is the best Japanese eraser?

For most people, the Tombow MONO PE-04A: a 55 mm white plastic block in the striped sleeve that Tombow has sold since 1969. The other six each do one job better, from keeping crumbs together to erasing ink. It’s #1 over the near-identical Seed Radar because it comes in five sizes and was a finalist on both smooth and toothy paper in The Well-Appointed Desk’s test.

  • Best overall: Tombow MONO PE-04A. Why it’s here: phthalate-free, in five sizes, at ¥132 (about US$0.80) in Japan, and The Well-Appointed Desk named it a finalist on smooth and toothy paper.
  • Close rival: Seed Radar SR-100. Why it’s here: the other classic Japanese block, sold since 1968, with a 97% erasure rate Seed reports and a sleeve cut at the corners so the eraser doesn’t snap.
  • No crumbs: Tombow MONO Dust Catch. Why it’s here: the only pick whose crumbs clump and stick to it, at MONO size; Tombow Japan warns it can smudge some inkjet papers.
  • Precision: Tombow MONO Zero. Why it’s here: its 2.3 mm round tip removes a single letter, which no block can, and it refills.
  • Click-out: Tombow MONO Knock. Why it’s here: a click-out holder with a thicker 3.8 mm stick than the Zero’s, for whole words, refilled in packs of 4.
  • Ink: Tombow MONO Sand. Why it’s here: the only pick for ink: silica grit shaves off ballpoint and colored pencil with a thin layer of paper, per Tombow Japan.
  • Foam: Sakura SumoGrip B80. Why it’s here: the only foam block, which Sakura says lifts graphite with light pressure.

How did we choose these picks?

We compiled these picks from published sources, not hands-on testing: makers’ specs and claims (Tombow, Seed and Sakura in Japanese), retailer listings, The Well-Appointed Desk’s eraser test, US availability and price band. We chose one eraser per job, because blocks, pen erasers, sand and foam erasers each do different work.

How do the Japanese erasers compare?

Three are near-identical 55 mm blocks; the rest are two pen erasers, a sand eraser and a foam block.

Eraser Pick Size Material Japan price Band
Tombow MONO PE-04A Best overall 55 × 23 × 11 mm (2.2 × 0.9 × 0.4 in) Plastic (PVC), phthalate-free ¥132 (about US$0.80) $
Seed Radar SR-100 Close rival 55 × 21 × 12 mm (2.2 × 0.8 × 0.5 in) Plastic (PVC), phthalate-free ¥110 (about US$0.70) $
Tombow MONO Dust Catch No crumbs 55 × 23 × 11 mm (2.2 × 0.9 × 0.4 in) Black PVC tack polymer ¥154 (about US$1.00) $
Tombow MONO Zero (round) Precision 120 mm (4.7 in) pen, 2.3 mm tip Synthetic rubber, non-PVC ¥495 (about US$3.10) $$
Tombow MONO Knock Click-out Pen, 3.8 mm stick MONO eraser stick ¥120 (about US$0.80) before tax $
Tombow MONO Sand (ES-512B) Ink 67 × 16 × 8 mm (2.6 × 0.6 × 0.3 in) Natural rubber with silica Not listed here $
Sakura SumoGrip B80 Foam About 54 × 22 × 11 mm (2.1 × 0.9 × 0.4 in) Open-cell foam Not sold in Japan $

Sizes and prices are from Tombow, Seed and Sakura, plus retailers (MonotaRO, JetPens, the Hobonichi store); Japanese prices include tax unless noted.

Japanese eraser top faces to scale: MONO 55 × 23 mm, Radar 55 × 21 mm, Dust Catch 55 × 23 mm, MONO Sand 67 × 16 mm, SumoGrip 54 × 22 mm, plus the MONO Zero 2.3 mm and MONO Knock 3.8 mm tips
The three classic blocks are the same length; the sand eraser is longer and slimmer.

Tombow MONO or Seed Radar?

Either: they’re the two classic Japanese plastic erasers, launched a year apart, and both erase graphite cleanly. Seed reports a 97% erasure rate for the Radar in the Japan Eraser Manufacturers Association’s test and says its crumbs don’t scatter.

The MONO is the easier one to buy in the US and comes in five sizes, as does the Radar. For a Western comparison, see our best erasers, led by the Staedtler Mars plastic.

Which eraser keeps your desk clean?

The MONO Dust Catch, whose tacky polymer makes crumbs gather and stick to the eraser. Tombow Japan says it keeps MONO-level erasing, but warns it can smudge some inkjet papers black.

The SumoGrip takes another route: its open-cell foam traps graphite, and Sakura says the crumbs roll into strands. Its black color also hides graphite, so it doesn’t look grubby.

What is the best eraser for small details?

The MONO Zero, which removes a single letter with its 2.3 mm tip. Tombow says each click advances the eraser less than 1 mm, and a rectangular version has a 2.5 × 5 mm tip.

The MONO Knock’s 3.8 mm stick clears whole words faster and costs less. Both refill: ER-KUR sticks for the Zero, 4-packs of ER-AE for the Knock.

Can a Japanese eraser remove ink?

Yes, a sand eraser can: Tombow Japan says the MONO Sand removes ink by shaving it off with a thin layer of paper. Tombow USA lists ballpoint, rollerball, colored pencil and some marker; work gently on thin paper.

In May 2021 Tombow recalled about 840,000 Japanese-market sand erasers made from 2016 to 2021 after metal fragments were found. The current US item is 57304.

Where are they made?

Retailers list the MONO, Dust Catch and MONO Zero as made in Japan; the makers don’t state a country for the others. St. Louis Art Supply says its MONO stock comes from Vietnam, and Seed has a subsidiary there, so check the sleeve.

The SumoGrip is a Sakura of America product that Sakura’s Japanese site doesn’t list.

Frequently asked questions

Are Japanese erasers better?

Not always, but they test well: The Well-Appointed Desk named the Tombow MONO a finalist on smooth and toothy paper, with the Staedtler Mars plastic close behind. Japanese makers also sell specialist erasers that are hard to find elsewhere, such as crumb-catching and sand erasers.

Is the Tombow MONO or the Seed Radar better?

They are near twins: both 55 mm plastic blocks from the late 1960s, both phthalate-free. Seed publishes a 97% erasure-rate result for the Radar; the MONO is easier to find in the US.

Which eraser doesn't leave crumbs everywhere?

The Tombow MONO Dust Catch, whose tacky polymer makes the crumbs clump and stick to the eraser. The Sakura SumoGrip's crumbs roll into strands that are easy to sweep up.

Can an eraser remove pen ink?

A sand eraser such as the Tombow MONO Sand can remove ballpoint, rollerball and some marker by abrading a thin layer of paper; it won't work on thin paper without some damage.

What is the smallest-tip Japanese eraser?

The Tombow MONO Zero, with a 2.3 mm round tip or a 2.5 × 5 mm rectangular one, refilled with ER-KUR sticks.

Does the MONO Sand eraser contain latex?

Tombow USA says its version, item 57304, contains natural rubber latex; the plastic MONO, Radar and Dust Catch blocks are PVC.

Are these erasers made in Japan?

Retailers list the MONO PE-04A, MONO Dust Catch and MONO Zero as made in Japan, though one US shop says its MONO stock is from Vietnam. Seed, Sakura and Tombow don't state a country for the Radar, SumoGrip, MONO Knock or MONO Sand.

Sources (8)

  1. Tombow Pencil (Japanese): MONO eraser (launched 1969, 5 sizes, PE-04A ¥132, phthalate-free)
  2. Seed (Japanese): Radar SR (sizes, prices, JAN codes, 97% erasure rate, cut sleeve corners)
  3. Tombow Pencil (Japanese): MONO Dust Catch (tack polymer, EN-DC ¥154)
  4. Tombow Pencil (Japanese): MONO Zero (2.3 mm round and 2.5 × 5 mm tips, ER-KUR refills, ¥495)
  5. Tombow USA: MONO Knock Eraser, Blue (round, 3.8 mm)
  6. Tombow Pencil (Japanese): MONO Sand Rubber and Sand erasers (natural rubber and silica, shaves ink with the paper)
  7. Sakura of America: SumoGrip Eraser (open-cell foam, B to 2H, phthalate-free)
  8. The Well-Appointed Desk: The Great Eraser Rub-Off Challenge (July 7, 2016)

Plain-text version for AI agents: best-japanese-erasers.md · Spotted an error? See how we check facts.