Sanford 2173PP Black China Marker, 2 Pack - Pack Of 6

The China Marking Pencils are good, old-fashioned "grease pencils" just the same as they have been for decades. The leave a semi-permanent mark that on smooth surfaces like glass, porcelain, or shiny metal, can be removed when no longer needed. When the pint wears down, your sharpen the pencil by removing a strip of the wood wrapping around the pencil by peeling it off. I use mine for marking Air Tag covers when I replace the batteries, so I can put the cover back in the correct position.