R-3500 America Style Most Popular Universal Tire Repair radial bias tire repair cold patch for Passenger Car 2 1/4" 500PCS Size:57mm (2 1/4") Material:Natural rubber Color:black vulcanizing gum,blue poly backing Usage:Permanent tire repair Universal All Purpose Patch These patches are designed for use on Radial and Bias-Ply tires. New formula and thicker rubber help resist dimpling. Can also be used for inner tube repairs.