2 PCS Puncture Proof Belt Tire Liner (Polyurethane Composite) Key benefits Reliable protection against glass, stones and road debris to reduce inner tube punctures on mountain trails, highways and urban streets. Very light and thin — 64 grams for 700C — so it adds virtually no extra weight and does not affect ride performance. Secure, longlasting defence: automatic shrinkage under pressure ensures a tight fit inside the tire; supertough elasticity resists cuts and abrasion even in rough terrain. What it is and how it works Two polyurethane composite tire liners (puncture proof belt set) designed to sit between tire and tube. The liner shields the inner tube from sharp objects while preserving ride feel. The material is lightweight, thin and flexible, reducing the chance of tube damage without changing handling or comfort. Compatibility and sizing Tyre tape solution: install by attaching the liner directly to the inside of the tire. Compatible with mountain, folding and commuter bikes. Can be cut to fit different tire sizes, including 26', 27.5', 29' and 700C (64 g weight quoted for 700C). Installation and maintenance Easy to install: stick the liner inside the tire and trim to fit as needed. Automatic shrinkage under pressure helps it seat securely. Durable elasticity maintains protection over repeated rides and rough conditions; inspect periodically and if excessively worn. Use scenarios Daily commuter: prevents flats from glass and road debris on city streets. Mountain biking: reduces punctures from stones and sharp trail debris on singletrack. Long road rides: protects tubes from roadside hazards on highways and mixedsurface routes. Contents 2 pieces puncture proof belt (tire liners).