Great art starts with great products. Louis Prang developed child-safe art products that uphold the highest standards of quality in materials and color. These standards are maintained today in a comprehensive line of Prang art products for both children and professionals. Prang Freart is 4 x 1 Inch chalk perfect on paper and preferred for outdoor sidewalk art for its color and strength. Freart withstands wind and rain and does not wash away unless you want it to (must be power washed). Freart Chalk comes in a beautiful array of 12 assorted colors and is AP Certified non-toxic. Be bold, color your world, and discover Prang power.