This pack of non-toxic outdoor chalk includes a rainbow of 12 vibrant colors, and each piece is intelligently designed in the shape of a block, which means theyre stackable! Easy to grip and washable, this set is also perfect for getting little ones outside for activities like hopscotch, driveway or sidewalk art, or just some free expression. This set also makes a great gift for kids of all ages! Includes a set of 12 outdoor chalk blocks Designed in the shape of easy-to-grip blocks For use on pavement, concrete, sidewalks, and driveways Non-toxic and washable off skin with soap and water Washes off nearly all fabrics (for best results wash immediately in hot wash cycle) Adult supervision is advised Suitable for ages 3 and up