Tannus Armour. Features: Sitting between your tire and inner tube, Tannus Armour provides 15mm of puncture protection under tread, and 2mm of sidewall protection from sharp objects and rocks Eliminates 90% of all punctures due to its reinforced sidewall and underside protection Run at lower pressures for increased grip in wet conditions and loose rock Absorbs vibrations for a smoother, more comfortable ride Engineered to minimize rolling-resistance (drag), Tannus Armour provides the ultimate balance of speed and protection Installation is as quick and easy as installing a regular tire and is maintenance free Specs: Package: single Wheel Size: 26" Width: 4.0-4.5" Weight: 300g