Kool Stop Steel Disc Pads. Features: High performance disc pads from the most trusted name in aftermarket brake pads Organic: blend of organic materials with a top quantity resin provides excellent performance throughout the life of the pad. Organic pads have steel back plates in red Sintered: metallic compound provides performance in extreme conditions for ultimate stopping power, durability, and pad life. Sintered pads have copper plated back plates Includes pad retention spring Specs: Fits:2011+ Avid Code 4-piston Compound:organic