These chalks are perfect for the outdoors, works well for sidewalk hopscotch, sidewalk art or drawings on chalkboards. They are dust free and washable. Formulated to minimise sidewalk chalk dust. Contains 24 washable chalks (with marble pattern, dot pattern, rainbow pattern, spiral pattern), and 2 chalk holders to avoid dirtying hands . Packed in a handy plastic storage tub. Great fun for all ages.