Precautions in use

Mechanical pencils :How long is the durability of mechanical pencils

The durability of the chuck is almost the same as that made of plastic and metal, and it is possible to knock more than 100,000 times. 0.6 mm is pushed out per knock, it becomes possible to use more than 1,000 60mm cores for calculation.
In the calculation, it will be able to write 30,000 pieces of letters on the 400-letter manuscript paper.
(1000 × 300m/piece ÷ 10m× 400 characters = 1 1200 character)

Back to Tombow Q&A


Digital catalog is available for online reading.

General Info Catalog

General Information of Tombow 2022-2023 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.