The Shimano H01A Resin Disc Brake Pads and Spring with Fins are a reliable and high-quality replacement option for Saint BR-M820 and Zee BR-M640 calipers. These brake pads are made from durable resin compound, which provides low noise and excellent power modulation for improved control and safety on the trail. Additionally, the pads feature aluminum radiator cooling fins that increase pad life and reduce brake fade. The backing plate material also made of Aluminum which improve the durability of the pad. These brake pads are designed for high-performance riding, and are compatible with the Pad Shape Number 51. The Shimano H01A Resin Disc Brake Pads and Spring with Fins are a great choice for both recreational and professional riders looking to improve their brake setup.