Teeth Type：40T
Material：Made from 7075AL，Fully Machined. 16T:hardened steel.
Colours Options：Anod. Black,Red,Gold,Silver,Green or Blue.
Weight：66 g / pc
Compatibility：Only for Shimano 10 speed XT & XTR Cassettes.
Installation：Requires removal of the 17T or 15T cog & spacer from your cassette to use this cassette sprocket. (11-13-15-19-21-24-28-32-36-40) or (11-13-17-19-21-24-28-32-36-40)
If you add 16T cogs, you will remove both the 17 & 15T cogs. (11-13-16-19-21-24-28-32-36-40)