Keep dust to a minimum with this almost completely dust-free, hard blackboard chalk. 12 sticks, nine colors: brown, carmine red, cobalt blue, green, light blue, lilac, orange, vermilion, and yellow. Colors are more muted than our Blackboard Chalk. 3.25" long, 1/3" diameter. Made of calcium carbonate. Due to the nature of chalk it may arrive broken but is still considered usable. Netherlands. Ages 3 and up.