The BR-M7100 is a 2-piston hydraulic disc brake caliper is part of Shimano’s SLX series for Mountain bikes. The BR-M7100 allows for stable & versatile high-performance break control. This product uses Mineral oil brake fluid which is non-corrosive & less hazardous than conventional hydraulic brake fluid. In addition, it is very quick & easy to assemble. Recommended to be paired with the BL-M7100