Pirelli Cinturato SmarTube X Tube - 700 x 40 - 50mm 60mm Presta Valve70% weight savings compared to conventional tubes 50% smaller than conventional tubes 3x thicker than standard SmarTUBES Not for use with rim brakes Not designed to be repaired Constructed of Thermoplastic Polyurethane Weighs just 150 grams Specifications: Tube Weight 151g Tube Width 40 50C Valve Presta Valve Length 42mm Wheel Diameter 700C Shaft Type Non threaded