Lighter, more compact, and more durable. Yep, you get all three. The NanoAir TPU (Thermoplastic Polyurethane) tubes were designed to be compact and pack down to one third of the size of a traditional tube. It's 60% lighter than a traditional tube, making it a great option to reduce rolling weight and easy enough to carry a spare. The NanoAir TPU tubes are tough, with a special construction/layup of material these are more durable than traditional butyl tubes. Having one of "those days," and you ride through a patch of thorns and get another flat? Don't worry, each tube includes a few extra TPU patches to keep you rolling. Made from TPU (Thermoplastic Polyurethane)Lightweight and durable inner tube solution that's compact, while offering reliable performanceReduces rotational weight compared to a butyl tubeAn ideal spare tube to carry on any rideAlloy presta valveIncludes TPU patchesItem SpecificationsISO Diameter622 / Road / 29"ISO Width (mm)48ISO Width (mm)49ISO Width (mm)50ISO Width (mm)51ISO Width (mm)52ISO Width (mm)53ISO Width (mm)54ISO Width (mm)55ISO Width (mm)56ISO Width (mm)57ISO Width (mm)58ISO Width (mm)59ISO Width (mm)60ISO Width (mm)61ISO Width (mm)62ISO Width (mm)63Labeled Size29 x 1.9 - 2.5Shaft TypeSmoothTube CompoundThermoplastic ElastomerValve CoreFixedValve LengthMed 41-55mmValvePresta Med 41-55mm WTB NanoAir TPU Tube Tubes UPC: 714401150874