Double ended marker with a medium point and a fine point. The ink is acid free, non-toxic and Marvy˝ Matchable. 108 colors available. Acid Free and Non-Toxic Water-based ink. Double ended pens with medium and fine bullet-shaped points. Sets are available in interlocking canisters. You can combine any of the Artwin Canisters sets to create your own customized sets. A total of 9 colors sets available. Conforms to ASTM D4236- 108 Colors available.