Park Tool Emergency Tire Boots Pack of 3. The TB-2 Tire Boot is constructed from a strong waterproof vinyl membrane with fiber weave reinforcement. A super-strong pressure-sensitive adhesive assures the boot stays in place in any bicycle tire that utilizes an inner tube whether road or mountain high or low pressure. Application is as easy as wiping the area clean removing the backing and squarely applying the tire boot to the affected area. A true ride saver. Pack of three Dimensions: 76.2 x 44.4 mm (3" x 1.75")Not recommended for tubeless tire systems NOTE: The TB-2 Tire Boot should be considered a temporary fix. Always replace damaged tires as soon as possible