Wonder Stix write on almost anything! Dust-free and odorless, they offer bright, permanent color on paper, poster board, wood and cardboard. Also great for use on whiteboards, glass, windows and other non-porous surfaces; color erases easily with just a bit of water. They won't dry out, and there are no caps to lose. 12 assorted colors. Non-toxic, conforms to ASTM D4236.