Set of Eternal Colored Pencils with Clip Attachments, 12 Colors

"Eternal Pencil" is an innovative product that does not require sharpening due to its special tip. It works without ink or lead. Unlike regular pencils, it uses a special alloy of bismuth and tin, which, when in contact with paper,... triggers the oxidation process, leaving a gray mark on the surface of the paper.
This means it has been designed to leave a mark on the surface that oxidizes in the air.
As a result, the pencil writes "eternally," never running out and requiring no sharpening. The "Eternal" pencil got its name because it lasts significantly longer than regular graphite pencils. 
During writing, it hardly wears down unlike regular leads.
"Eternal Pencil" is a wonderful purchase for work or study. A case where a gift can be stylish, useful, and eternal.