Crayola-Tie-Dye Washable Sidewalk Chalk. Create BIG outdoor art with chalk in bright, bold Crayola crayon colors! The Anti-Roll shape keeps sticks handy without rolling away and produces fine lines or broad strokes that simply wash away with water. This 5.5x4x0.875 inch package includes five chalk sticks. Non-toxic. Conforms to ASTM D4236.