This chalk holder is made out of high quality PETG material. It has a screw-on lid and includes a matching magnetic belt clip. The belt clip and holder each have a Neodymium N52 magnet, forming a very strong bond.. These are low profile so the chalk doesn't need adjusting as it wears down. At 3d Dimensional Designs, we deliver innovative, durable, and practical solutions tailored to elevate your billiards experience. Chalk not included.