Chalk-O-Rama Dustless Chalk Crayons eliminate all of the pesky mess of traditional chalk. Never ask how to remove crayon from a chalkboard again! Shop OOLY.Chalk Sticks that Write Work on Many SurfacesFeels Like a Waxy CrayonPermanent on Porous SurfacesWipes Off Easily on Non-Porous SurfacesEncased in Plastic Barrels with Twist Up ActionSet of 12Suitable for Children 3 and Up