Kugel Bearings use premium quality Chevron Grade 2 molybdenum grease, mPulse unique technology ensures the electronic control systems track physical or substance changes and turn them into electrical indicators with unmatched precision, Exclusive multi-lip seals are made with Nitrile Rubber (NBR) which can successfully function at temperatures of-40°C while resisting contaminants from fluids and debris, Engineered with high-quality material to ensure long-term performance and the capability to resist high temperatures, Manufactured with CNC tooling, automated grinding and assembly lines for increased consistency, Made with corrosion-free coating for highest durability on the market, Inner rings are made of AISI 52100 alloy (high carbon) steel, low-alloy chromium steel, which meets ASTM International quality standards, Kit Includes: 2x Front Wheel Bearing and Hub Assembly (Both Side) + 2x Front ABS Wheel Speed Sensor (Both Side), Kit Variations: K7S-103163