Soft PVC (polyvinyl-chloride) plastic Jaw Pads prevent hard metal clamps from marring work piece. They can be used on various size C-clamps. The Jaw Pads are designed for standard 3 inch, 4 inch and 6 inch jaw width C-clamps. There are two pair of each of the three sizes (a total of 12 pieces). The PVC color is a bright red throughout.