Product Name: Everlasting Inkless Pencils Portable Reusable and Erasable Metal Writing Pens Replaceable Graphite Nib 

Package Contains: It has 2 Piece of Pencils

Color: Multicolor

Material: Metal 

Additional Information: Long eraser inside

Working principle: the nib rubs on the paper to decompose the alloy metal molecules and leave them on the paper surface