Smooth center tread with textured shoulders. a proprietary casing material technology developed for superior puncture protection and rolling resistance. The super light-weight material features a tighter weave than traditional puncture breakers while being lighter overall." Feature: Type of use: Road Size: 650 X 23c (23-571) Weight: 205 gr (650X23c) Maximum pressure: 130 psi, 9 bar Gums : Two rubbers Surface: Smooth TPI: 120