These chalk markers are for use on smooth surfaces such as glass, plastics, chalk boards, mirrors, ceramics and more. With three different tip sizes, this set will be useful for any application, and it is easily erasable while still wet. Details: White 3 tip shapes (fine, chisel and wide) Set of 3 chalk markers Water-based pigment ink Highly opaque Lightfast, odorless and xylene free Instructions on back of package CAUTION: Keep away from flames, even when empty.