PowerBrake - D-Line Rotor & Pad KitFeatures and benefits of PowerBrake high performance rotors & pads: Rotors are cast from a proprietary high carbon cast iron alloy. Rotors are machined to tolerances up to three times tighter than the industry norm. All Powerbrake rotors feature our MTR (Max Temperature Recording) system. Proprietary black rotor surface coating ensures quicker bed in and max brake performance. Spiral slots on rotor fiction surface clear friction gasses, debris, and