Round blackboard chalks dermatologically tested. They leave no dust. Pack of 10 pieces in 10 different colors in a blister. Round, white and colored blackboard chalks. They leave no dust. Diameter: 10 mm. Length: 80 mm. They are produced from natural chalk, containing mainly calcium carbonate, from the Champagne region of France. The chalks are dermatologically tested and apply to the blackboard, creating clean and distinct lines. They do not leave scratches on the board. Colors wash off hands and fabrics.
