The Shimano D03S-RX are resin brake pads on a steel backing plate without cooling fins. They have been designed for 4-piston disc brakes such as Saint BR-M820, XT BR-M8120 or SLX BR-M7120. The pads are 40% more wear-resistant than the previous model D01S, but continue to impress with low noise as usual for organic pads. In terms of braking power and dosability, they are in the upper area. The D03S-RX brake pads perform excellent in both dry and wet conditions.