1. Eternal pencil writing 1 m abrasion 0.005 mm, an eternal pencil nib theoretical writing about 5000 m, wooden pencil writing 1 m abrasion 1.8 mm, this product pencil nib theoretical writing length is about 50 times longer than 1 wooden pencil, eternal pencil is only relative to wooden pencil, not really never finish writing.

2. The concept of 'no sharpening' does not really mean that you don't need to sharpen the pencil, as with ordinary pencils, the material is graphite and clay, and the pencil will become thicker as it is written, except that in contrast to ordinary pencils, the entire tip is the lead core, not encased in wood, and it is up to the user to decide whether or not to sharpen the pencil.