Crayola chalkboard chalk offers strong, durable sticks with reduced breakage. Includes 12 sticks of chalk in an assortment of colours. Non-toxic children's chalk with the most trusted brand name for quality and safety. Strong, consistent formula resists breaking, scratching or skipping Can be used on traditional chalkboards, construction paper, cardboard, paper bags and kraft paper Each stick is 3-1/8-Inch long by 3/8-Inch in diameter and erases easily from chalkboards