KIN China Marker

Special Coloured Pencils for Writing on Gloss Surfaces Like Glass, China, Plastic, Metal, Cellophane Etc. Colours : blue, green, red, yellow, black, white, and graphite.
 
The grease pencil, a wax writing tool also known as a wax pencil, china marker, or chinagraph pencil, is a writing implement made of hardened colored wax and is useful for marking on hard, glossy non-porous surfaces. This pencil is usually made from non-toxic opaque wax that is similar to a crayon but stronger.