Performance Machine 4 Piston Caliper Replacement Brake Pads

Fits 125x4 four-piston classic caliper and 137x4B four-piston differential bore direct bolt-on caliper
Organic compound: Quieter, less heat transfer, maintains rotor finish better, shorter lifespan
Sintered compound: Generates more noise, extreme stopping power, deteriorates rotor faster, longer lifespan