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.

  • Environmental products

    · Conformance to the Act on Promoting Green Purchasing

  • Phthalate Free


  • ET-ST

110 yen (excluding tax 100yen)

Environmental information


Product name Serial number Ratio of recycled materials under Eco Mark standard Certified Number of Eco Mark Ratio of recycled materials
under Promoting Green Procurement standard
Featured in GPN Eco Product Network Main Eco materials
MONO SMART ET-ST 70% 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.

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