Zig 50mm Posterman Biggie Tip Marker, Fluorescent Green Marker features a 50mm tip and is waterproof after drying Ideal for use on paper, plastic, wood, glass, metal and a variety of other surfaces Perfect for making big letters and painting large areas Works well on whiteboards or chalkboards Conforms to astm d4236 standard; available in fluorescent green color Marker features a 50mm tip and is waterproof after drying Perfect for making big letters and painting large areas Works well on whiteboards or chalkboards Conforms to astm d4236 standard; available in fluorescent green color