The Galfer USA Pro Compound is one of our most aggressive bicycle brake pads. This compound is often used for race use, and has an immense amount of braking power, will withstand mud and dirt, and has a high resistance to fade. Because of the aggressive nature of this pad, it may wear out faster than our less aggressive, Standard Compound if put under heavy use. COMPATIBILITY: Shimano BR-MT420 All Years Shimano BR-MT520 All Years Shimano Deore BR-M6120 All Years Shimano MT501 All Years Shimano SLX BR-M7120 All Years Shimano Saint BR-M810 All Years Shimano Saint BR-M820 All Years Shimano XT BR-M8020 All Years Shimano XT BR-M8120 All Years Shimano XT BR-M9120 All Years Shimano XTR BR-M9120 (4 Piston) All Years Shimano ZEE All Years TRP Quadiem All Years TRP Quadiem SL All Years TRP Slate T4 All Years Tektro HD-E725 All Years Tektro HD-M735 All Years Tektro HD-M745 All Years Tektro HD-M750 All Years