A 5.5mm thick eraser perfect for erasing lines in 7 and 6 mm ruled notebooks.

This 5.5 mm thick eraser made of a special composition to achieve both thinness and strength is ideal for erasing a single line in a notebook. It does not bend and can erase from small details to large areas. A new standard item of the trusted MONO series.

Product Features

  • 5.5mm thick eraser

    The eraser is ideal for covering markings in a notebook line-by-line as it is thinner than the space between the ruled lines in 7 and 6 mm ruled notebooks.

  • Highly rigid eraser

    Special formula to achieve both thinness and strength. Firm and reliable.

  • High erasability

    The high performance of the trusted MONO brand.

  • Slim & long body

    Fits the hand well and comfortably.

  • Easy to carry around

    The slim body ideally fits every pen case.

  • Sleeve with U-cut corners

    The corners of the sleeve are cut into U shape, to prevent them from damaging the eraser's body.

  • Green Tombow products

    50% or more waste paper pulp is contained in the paper sleeve by mass.

    · Conformance to the Act on Promoting Green Purchasing

  • Phthalate Free


  • ET-ST

132 yen (excluding tax 120yen)

Environmental information


Product name Serial number Green Tombow Product Ratio of recycled materials under Eco Mark standard Certified Number of Eco Mark Ratio of recycled materials
under Promoting Green Procurement standard
Posted on the GPN Eco-products Database Main Eco materials
MONO SMART ET-ST Over 50% waste paper pulp (sleeve) Waste paper pulp (sleeve)




  • 2013

    Good Design Award

  • 2014

    iF Design Award

Precaution for Use

· The eraser and eraser dust may stick to or dissolve on the painted or plastic surfaces.
· Put the eraser in the sleeve after use.
· Keep it out of the reach of small children.
· Do not use it for purposes other than erasing.

Browse more products


Digital catalog is available for online reading.

General Info Catalog

General Information of Tombow 2024-2025 Lineup of all products of Tombow

Open the catalog

Eco Info Catalog

Information and lineup of environmental products of Tombow

Open the catalog

Downloadable PDF version is available.

Catalogs can be viewed and saved in smartphone, tablet and PC in use of “iCata” digital catalog service.

Product information in catalogs is created at the time of catalog production. Please note that design, specification and other information may change without notification.