... FEATURES 1) Slotted Drilled and Vented Design From Jingheng Auto Parts. Rotor surface temperatures,which rise rapidly from repeated stopping ... to escape,Less expensive,non-ventilated rotors overheat,causing rapid brake pad deterioration, excessive rotor surface wear,and warping. Manufactured ... of steel,It will not warp. 3) Hub Assembly Parts Available: Hub bearing,Seal,Dust Gap,Springs,Bolts,Nuts, ...