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, 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, Inner rings are made of Case-Hardened Steel for improved resistance to surface wear and contact fatigue, Thickness and metallurgy electronically validated for manufacturing consistency, SAE J1714, J2525 and J2535 validated for OEM load-carrying capacity, durability, and performance characteristics, Bearing already mounted and secured on the assembly to required OE torque specification for easier and faster installation, Part Reference Numbers : 1411-326399 WE61271 91-326399 94-326399 S512511 NT512511 WH512511 MB10303 512511 33 40 6 850 156 33 40 6 850 159 33 41 6 775 021 BR930525 BM500023 TRB-512511, Kit Includes: 2x Rear Wheel Bearing Assembly (Both Side)