CeramicSpeed PF30 Bottom Bracket. Features: Save watts and ride faster with guaranteed lowest friction, optimized power transfer, and longest product lifetime PF30 bottom bracket standard Coated: metallic layer that covers bearing races making them 75% harder than steel. Even lower friction and highly resistant to corrosion Standard: low drag with hardened steel races and ceramic ball bearings Offered in 24mm for Shimano, FSA, Race Face, etc, and 28.99mm for SRAM DUB In the box: 2 cups, 2 dust covers, 10mm syringe of All Round Grease, and sticker sheet Specs: Model:coated Interface:24mm spindle Shell:PF30 Width:68mm Color:black