Quartet Alpha Non-Toxic Low Dust Chalk, 3/8" Inch Diameter, White, 12 Sticks per Pack (314005) Non-toxic, low-dust Alpha chalk delivers extra-smooth and easily erasable writing Adds emphasis and extra impact on heavy-use chalkboards and paper Superior-quality, impurity-free chalk is non-toxic, clean and safe for high-use areas White sticks with 0.38 Inch diameter Box of 12 sticks of chalk