The Tubolito Tubo MTB 27.5 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 MTB 27.5 Tube Features 47% lighter –up to 135g weight saving per wheel 45% smaller packed size 2x more robust at puncture test Same comfort as a butyl tube Valve length: 42mm