1. Durable & Save Cost: Metal erasable pens can replace up to 100 traditional pencils by using compressed nibs, without the need to sharpen or replace the refills; It helps you reduce the time of sharpening or adding ink, saving money, and can serve you for a long time. 2.Working Principle: The reason why this metal inkless pen can write without sharpening or ink is that the nib rubs on the paper to decompose the alloy metal molecules and leave them on the surface of the paper. 3.Easy to Save: Inkless pen can be applied on most paper, and the handwriting can be retained for a long time, regardless of temperature or weather conditions. 4.Wide Range Of Use: This everlasting pencil is suitable for childrens drawing, writing diary, taking notes, making scrapbooks and other art projects, and their handwriting is erasable. 5.Practical Gifts: These metal inkless writing pens can be regarded as practical gifts for children, students, teachers, friends, etc., wont consume wood, odorless and safe to use; They will be surprised to get such delicate gifts.