Built using the same architecture as the Guide brakes, but with larger fluid reservoir and pistons, it delivers even more power and heat management. SRAM's SwingLink lever actuation design provides great modulation. -Four phenolic plastic pistons provide the stopping power and excellent heat management -Stainless steel heat shield breaks the thermal connection between the brakes pads and the caliper body, which reduces fluid temperature -Bleeding Edge design for easier maintenance -Includes steel-backed sintered metal pads