WTB NanoAir TPU Tube - 29 x 1.9 - 2.5 48mm Presta ValveNanoAir 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 TECH SPECS tire size 29" tire width 1. 9 2. 5" valve Presta length 48mm (threaded)