##Enduro ABEC3 6806 MAX Bottom Bracket Bearing 30x42x7 (Single) Enduro's ABEC3 6806 MAX Bottom Bracket Bearing 30x42x7 (Single) features high precision balls that are within 10/1,000,000″ round; twice as round as the industry standard, at it’s highest level. Produced using the vacuum de-gassed process for the purest chromium alloy steel, the balls are hardened to R-62 levels making them extremely tough and very durable. Polished to a mirror finish for ABEC-3 precision and noiseless movement.