Harzole UBP-2608 USA StyleHeavy Duty Radial ply 4 ply 8 1/2" 2pc/bag Bias-Ply Repair PatchTire patch Tire patch Plug Used to repair crown, sidewall and shoulder injuries in Passenger, Light truck, Truck, Tractor and Earthmover tyres. Each reinforcing ply is individually end-wrapped to deflect tire flexing stresses in a unique manner . Tie-gum construction eliminates the potential common in competitive products Designed to vulcanize chemically or in low temperature systems. Gray and Black vulcanizing gum, blue poly backing