School Smart Sidewalk Chalk is a long-lasting and colorful favorite! Set of 52 pieces includes 8 classic and bold colors, with each chalk stick measuring 4 L x 1 W inches for a wide and sturdy grip. Comes in reusable plastic tub for keeping all pieces organized or to stock other small accessories or toys. Kids and teachers alike will have endless fun and freedom of expression with creating designs, games, or even lesson plans on blacktop, concrete or other similar surfaces. Recommended for outdoor use. Non-toxic; conforms to ASTM D-4236. Created for ages 3 and up.