WTB NanoAir TPU Tube 700 x 18-32mm 48mm PVNanoAir TPU (Thermoplastic Polyurethane) tubes are light, compact and durable Packs down to one third the size of a traditional butyl tube and is less than half the weight Features a special construction layup that makes them more durable than traditional butyl tubes 2 TPU patches are included 700x18 23 35g, 700x32 47 49g, 29x1. 9 2. 5 80g Specifications: tire size 700c tire width 18 32mm valve Presta length 48mm (threaded)