The BSD Substance Mid Bottom Bracket Kit includes 2 precision sealed bearings, 2 CNC machined 6061 aluminum cone spacers for a clean look, an aluminum internal spacer, 4 steel crank arm spacers for dialing in your chain alignment, 15/16" sprocket adapter, and a 10 x 1.5mm sprocket bolt. Keep your pedaling buttery smooth with the BSD Substance BB Kit. (5.8 oz)