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, Thickness and metallurgy electronically validated for manufacturing consistency, Kit Includes: 2x Rear Kugel Wheel Bearing (Both Side) + 2x Rear CMX Brake Drum (Both Side)