Made of durable, lightweight urethane, Mr. Tuffy provides a protective layer between the outer tire and inner tube. Urethane has a property which makes it very elastic. When a thorn or piece of glass attempts to penetrate the Mr. Tuffy liner it comes up against a surface that is both hard and elastic. The object pushes against the surface which gives way while resisting initial penetration.
Fits 700c x 20-25 and 27″ x 1″ tires
Advanced micro-shell technology features a hardened protective outer layer and an ultra-soft inner layer to cushion the tube
Weighs less than liquid sealants or thorn-resistant tubes
Easy to install–no gooey mess
Contributes to a smooth, stable ride