The Angel SmarTube X is Pirelli's latest innovation in the world of tubes designed to protect and provide comfort for daily riding and fast urban commuting. Made with thermoplastic polyurethane (TPU) a material that can save up to 70% of the weight while being stronger than butyl as a raw material. This product is 3 times thicker than a standard SmarTube and allows the cyclist to be more agile while being extremely protected at the same time.