Advanced Ceramic Friction FormulaFeaturing the same aluminum-based alloy used in aerospace engineering, QuietCast copper free brake pads are 2025 Copper Free Legislation compliant. | Protective transfer layerChemical formula forms a protective layer on the rotor and pad surface to extend the life of the pad and rotor. | OE-style rubber core shimEnhanced manufacturing techniques create a high quality, long lasting shim resulting in lower noise, increased strength, and corrosion resistance. | Bosch Hardware KitEach QuietCast 'kit' contains everything you need to do the job right. |