Swan White Chalk is an essential tool for children's chalkboards and other surfaces. Strong, consistent formula resists breaking, scratching or skipping. Bright white shows up brilliantly on dark and colored surfaces. Use it on traditional chalkboards, construction paper, cardboard, paper bags and kraft paper. Each stick measures 3/8" diameter x 3-1/8" long. Nontoxic children's chalk also provides quality and safety.