The Shimano D03S-RX are resin brake pads on a steel backing plate without cooling fins. They were 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 predecessor model D01S, but still convince with low noise development, as usual for organic pads. In terms of braking power and dosing ability, they are in the upper range. The D03S-RX brake pads perform excellently in both dry and wet conditions.