Zig 6mm Posterman Broad Chisel Tip Marker, Fluorescent Green Marker features a broad 6mm chisel tip and is waterproof after drying Ideal for use on paper, plastic, wood, glass, metal and a variety of other surfaces Perfect for writing small letters on signs, boards and more Works well on whiteboards or chalkboards Conforms to astm d4236 standard; available in fluorescent green color Marker features a broad 6mm chisel tip and is waterproof after drying Perfect for writing small letters on signs, boards and more Works well on whiteboards or chalkboards Conforms to astm d4236 standard; available in fluorescent green color