Brilliant colors in chalk are designed for use on paper and surfaces other than chalkboards. Tubular shape fits easily and comfortably in your hand. Drawing chalk is nontoxic. Crayola Colored Drawing Chalk Sticks - 3.2in. Length - 0.4in. Diameter - Assorted - 144 / Box is one of many Board Accessories available through Office Depot. Made by Crayola.