Full symmetrical machining provides perfect balance, perfect flatness and the truest rotation of any aluminium rotor being built. Wilwood's engineered drill and relief slot pattern combines the highest degree of weight reduction with the highest resistance to thermal distortion in the contact faces. You get smooth engagement and a consistent full pedal from the low knock-back characteristics of this design. A durable black anodised finish prevents corrosion and simplifies the visual inspection of the contact faces. The best results are always achieved using PolyMatrix Q compound brake pads with these rotors.