Colorful chalk is an essential tool for children's chalkboards and other surfaces. Strong, consistent formula resists breaking, scratching or skipping. Bright colors show up brilliantly on dark and colored surfaces. Set includes two sticks each of color: red, orange, yellow, green, blue and violet. Use chalk on traditional chalkboards, construction paper, cardboard, paper bags and kraft paper. It writes smoothly and erases easily from chalkboards. Each stick measures 3/8" diameter x 3-1/8" long. Nontoxic children's chalk also provides quality and safety.