And the winner is...
Crayons and Pens
Bic Soft Grip Fine Point Dry Erase Marker - Black
The Great Erase Grip Fine Point Dry Erase Marker is perfect for use on dry erase boards, glass and most non-porous surfaces. It features a molded grip zone for added control, and it easily erase with a dry cloth, tissue or felt eraser. Low-odor, ACMI approved non-toxic ink.