The Kitpas Crayons for Bath Sets include 6 Kitpas Crayons for Bath (red, green, blue, pink, yellow, purple), a yellow or blue Sponge and a waterproof case that adheres to the bathroom wall. The Kitpas Crayons for Bath are specially formulated crayons designed to be used on wet surfaces such as bathtubs. 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. All Kitpas Crayons are known to be buttery smooth, vividly coloured, water soluble, completely non-toxic and easy to clean. All you need to do is simply wipe over a few times with a sponge and rinse with water. Although Kitpas for Bath are designed to draw directly on wet surfaces and bathtubs, Kitpas Bath crayons are not recommended for use on bathroom walls or tiles.