Harzole USA Style Heavy Duty Radial ply SP-2217 Four ply 7-3/4" x 9" 197x228mm 2pc/bag Tire Repair Adhesive Tyre Patch/ radial vulcanized rubber patch tire puncture seal 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, bule poly backing