The new Erox Carbon Window disc is structured from 3k woven carbon ensuring strength, stiffness and durability. The Window disc has been developed to give you all the aerodynamic benefits of a full disc wheel but with the ability to win time in all conditions whether cross wind, no wind, flat or hilly. This patented, wind tunnel tested wheels cut through the air like a razor with vibration damping comfort. SKF bearings. Free body is changeable and compatible with Shimano, Campagnolo and SRAM. Weight 990g.