Core made of High-Carbon AISI 52100 Chromium Alloy Steel features higher wear resistance, fatigue strength and steel hardness, Premium quality MolyPro™ NLGI Grade 2 Molybdenum Grease (MoS2) to minimize wear and reduce friction providing longer lasting performance, Engineered with carbon-enhanced XCast™ (G3000) iron castings to achieve an optimal wear resistance, tensile strength and steel hardness providing unmatched braking performance, Exclusive multi-lip seals are made with ProSeal™ Nitrile Rubber (NBR) which can successfully function at high delta of temperatures while retaining its flexibility and sealing performance, 100% Precision Spin and Mill-Balanced for smoother stopping and zero vibration at any speed, Inner rings are made of Case-Hardened Steel for improved resistance to surface wear and contact fatigue, Cross-Hatched smooth surface to improve the pad's ability to grip the rotor surface, especially during initial brake applications or in wet conditions, Kit Includes: 2x Rear Kugel Wheel Bearing (Both Side) + 2x Rear CMX Brake Drum (Both Side), Kit Variations: K7D-100136 K7D-101006 K7D-101012