Dieters Graffiti spray chalk is the washable spray chalk that can be used to decorate different surfaces: walkways, playgrounds, walls, windows, meadows, snow, sand and so on. The graffiti spray chalk is water based and can be washed off with water or a damp sponge or washed off by the rain. As with normal chalk, you can mark your heaven and hell field or mark a road for the bobby car, a playing field in the meadow, or the track for a game of rabbits and dogs. Set includes 3 pieces of spray chalk in 3 different colours.