A 3-color set of the Biggie 50 marker. Cool set includes: Green, Blue, and Violet. This marker has a very large, 2" wide tip (50mm). High opacity, water-based pigmented ink. Suitable for marking most surfaces including glass, metal, paper, plastic, mirrors, wood and stone. Great on posterboard. Works well for advertisements on chalkboards and glass surfaces. Marks stay on glass until you wash them off with glass cleaner. Marks wash off chalkboards with a standard household cleaning solution. Safe / Non-Toxic.