Elementary School Students HB Can't Finish Writing With A Hard-wearing Pencil

Product information:

Material: Alloy
Shell material: plastic
Lead core hardness: HB
Purpose: writing pen
Total length of pen body: 14cm
Color: red, black, pink, yellow

‘Unfinished’ description:
1. The comprehensive wear and tear of this product is about 0.005mm when writing 1 meter, and the loss is about 0.0062 cubic millimeters, and the writeable volume is about 99.011 cubic millimeters.
Theoretical writing is about 15,900 meters
2. The abrasion of a wooden pencil is 1.8mm per meter (International GB/T26704- -2011) theoretically writing 100 meters.
The theoretical writing length of this product is 159 times that of a wooden pencil.
"Unfinished" is just relative to a wooden pencil, not forever.

Style： 4 pens and 8 replacement heads

Features:

No ink required for long-lasting writing

Packing list:

A pencil