1.Material:Sealed ceramic bearing inside, low centrifugal force, more durable, more lubricating, high temperature resistance, high speed.Precision machined threads, high-strength aluminum alloy, CNC process,lightweight and durable.
2.Shell width:Width 68mm、73mm, english BSA thread,works for any kind of MTB and road bike frame with thread.
3.Crankset Spindle diameter:left and right are both 24mm.
4.Compatibility:If your MTB and road bike is metal frame with thread, usually it works. For crankset, works for Shimano, Prowheel, IXF, and any 24mm and 24mm crankset. 
5.Color:Black ，Red ，blue ，Green ，Gold
6.Package content: 1 set bottom bracket and 3pcs width adjust washer.