AA 2 1/8 Medium Foil Back Tube Tire Repair Patch (Box of 50) - High Quality Bike & Motorcycle Tire Puncture Repair Kit for Road, Mountain Bikes - Perfect for Emergency Fixes on the Go

AA black vulcanizing gum with foil-like backing. Tube repairs are non-reinforced and designed principally for use on inner tubes. These repair units are twice as strong as the tube being repaired and have a feather-edge design to prevent chafing. When repairing inner tubes, buttonhole the ends of the injury and select a repair unit at least twice as large as the injury being repaired.