The new SRAM DUB crank standard, based on a 28.99mm spindle, enables a bottom bracket design that is more resistant to contamination, while maintaining the maximum efficiency and long life qualities for which CeramicSpeed Bottom Brackets are known. With an integrated dust seal for all models, a precise and secure fit that fully protects the bearing face ensures exceptional performance with no compromise. Hand-built CeramicSpeed bearings transfer load from the crank to the frame with unmatched longevity and efficiency. In the box: 2 cups with CeramicSpeed bearings installed 2 dust seals Spacer tube 4 x 1mm spacers 4 x 3mm spacers Universal grease Decal