3-color set of the Biggie 30 marker. Warm color set includes: Red, Orange, and Yellow. The Biggie 30 has a large 1-1/4" wide tip that makes a 30mm mark. High opacity, water-based pigmented ink. Suitable for marking on most surfaces, including glass, metal, paper, mirrors, wood, stone and plastic. 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.