WTB NanoAir TPU Tube 27.5 x 2.5-3.0" 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 TECH SPECS model NanoAir material TPU tire size 27. 5" tire width 2. 5 3. 0" valve Presta (threaded) length 48mm weight