Mafia Gully Sprocket 28T BlackThe Mafia Gully Sprocket are strong replacements for your worn-out sprocket and made with 7075 T6 heat treated alloy. The 5 axis CNC machined sprockets are 6mm thick and is compatible with 19 and 22mm crank spindle sizes. The 24T size weighs 85g. Available in 24T, 25T, 28T, 33T, and 39T.0602798935535