A set of 3 fluorescent colors in the Posterman Big and Broad marker: FL Green, FL Pink, and FL Yellow. This marker has a large 5/8" wide tip that makes a 15mm 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. Equivalent to the Uni Posca PC17K Extra Broad marker. Safe / Non-Toxic.