Gelly RollÂ« Glaze Pens feature a glossy 3D pigment ink that does not bleed through most papers and are water resistant. They are unusual in that they can also be used on hard, non-porous materials such as glass, ceramic, CD's and Mylar. The roller ball writes a 0.7 mm line. Dry time is 45-60 seconds. Set includes Sepia, Turquoise, Hunter Green, Royal Blue, Gray, White, Real Red, Deep Green, Black, and Clear.