The WeThePeople compact bottom bracket uses high-quality precision sealed bearings for use with mid size bottom bracket shells. Includes WTP cnc 6061 alloy tube spacer and cones with a selection of spacers to help you dial in your drivetrain. MATERIAL: 6061 alloy tube spacer and outer spacers. SIZE: x2 High quality mid size bearings, 19mm or 22mm. SPECIAL FEATURES: incl. all necessary washers / bearings / spacers, etc. Colour: black.