Kitpas Crayons for Bath 10 Colours (white, pink, red, orange, yellow, green, blue, violet, brown, gray) with Sponge are designed to be used on wet surfaces such as bathroom tiles and baths. Not only are they hexagonal in shape for slippery hands but the crayons can also float in water for safekeeping and the paper that encases the crayons is waterproof for extra durability.