If you own a Cervélo, your bike likely has the BBright bottom bracket standard. The P5s do not; the same goes for older frames. To mount SRAM and Quarq cranks in this 79-92mm wide, 46mm diameter bottom bracket shell, this bottom bracket, complete with CeramicSpeed bearings, must be pressed in. This kit comes with CeramicSpeed Standard or Coated bearings already installed in the cups. Both versions feature super-smooth and super-round CeramicSpeed balls, contained in hardened steel cages. The Coated version has a metallic coating applied to the cages, making it even smoother and more durable, with lower resistance and longer life. In the box: 2 cups with bearings installed 2 dust covers 1mm Spacer 0.5mm Spacer Wave washer GXP Spacer tube Universal grease Adhesive