Specifications: Made of polyurethane polymer composite material, which is durable and toughness. It can protect your bike tires from punctures. Installs easily between the tube and tire to offer powerful puncture-proof protection. Provides physical barrier to block nails, thorns, glass and other debris. Type: Bike Tire Liner Material: Polyurethane Polymer Composites Features: Anti-Puncture, Durable, Easy to Install, Bike Tire Protector Size Details [Our Size 26"] Thickness: 0.5mm/0.02", Width: 40mm/1.57" (Approx.) [Our Size 27.5"] Thickness: 0.5mm/0.02", Width: 40mm/1.57" (Approx.) [Our Size 29"] Thickness: 0.5mm/0.02", Width: 40mm/1.57" (Approx.) [Our Size 700C] Thickness: 0.5mm/0.02", Width: 25mm/0.98" (Approx.) Notes: 26 inch tire liner can be used for 14/16/20 inch because the long part can be cut off, and 451 can use 700C as the same reason. Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Package Includes: 1 Roll of Bike Tire Liner