POOF SLINKY: Sidewalk Chalk. Sidewalk chalk makes outdoor fun fantastic and this box is the box for all outdoor art and game activities! Draw a map, outline a friend, make a basketball court. Anything you can imagine you can do! This package contains sixty 3-1/4x1 inch pieces of sidewalk chalk: twelve each of five colors (blue, green, red, white, and yellow). Recommended for ages 4 and up. Conforms to ASTM D-4236. Imported.