HDPE Plastic 1/4 inch thick, matte finish on both sides to hold and release clay more easily. Fits Brent, new Pacificia, Soldner and many others.
The 13 and 15 inch diameters are made in those sizes so that, when used on standard 12 or 14 inch wheel head, 1/2 inch of the bat overhangs all the way around the wheel head, making it much easier to remove the bat from the wheel without disturbing the thrown piece. No more prying, no more broken fingernails!