The Tubolito Tubo 29er MTB Tube is lighter, more resistant to punctures and rolls faster than a standard butyl tube. This is a great all-rounder, and TPU (Thermoplastic Polyurethane Elastomer) combines rigid and hard, with soft and elastic materials to give outstanding performance and longevity. Tubolito Tubo 29er MTB Tube Features 61% lighter –up to 135g weight saving per wheel 50% smaller packed size 2x more robust at puncture test Same comfort as a butyl tube Valve length: 42mm