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)