A great choice when linear pull brakes are used with carbon rims. These pads used to be very popular with the mountain bike crowd just prior to the disc brake revolution. Now cyclocross has breathed new life into the RxPLus with a new sense of purpose..The RxPLus has exclusive rubber compounds to provide superior braking power while providing modulation in challenging conditions. The Yellow King compound was specifically designed for carbon braking surfaces. They tend to be quiet and do not pulse like inferior carbon specific pads. Wear time is good and we sell them in sets of four. So order just one for a complete bike.