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The Enduro ACB 4545 150 SS is a premium 1-1/2″ (40 x 52 x 7mm: 45×45 deg) Angular Contact Headset bearing, engineered with full 440C stainless steel balls and races for unparalleled corrosion resistance and durability, especially in wet conditions or for frequently washed bikes. Unlike other stainless steels, Enduro’s 440C undergoes rigorous heat and cryogenic treatments to achieve superior strength, hardness, and wear resistance. Featuring LLB type seals and CRC Marine Grease, these bearings offer exceptional waterproofing. Designed with larger balls and a unique angular contact structure, they evenly distribute force, minimizing friction and maximizing lifespan, making them an excellent choice for demanding environments and a component found in many high-end headset brands.