Diamond China Marker (Box of 12 pieces) - Diamond China Markers are the improved version of a "grease" pencil.

One of the most versatile and easily used of all marking instruments. 

True, opaque pigment marks on all glazed and polished surfaces; glass, plastic, acetate, rubber, metal, etc. Grit-free, non-conductive leads. Round, paper wrapped, with string for easy sharpening. Firm leads. 6-3/4" long and 3/8" diameter.