This 2x 10 speed MTB chainset features a hollow-forged aluminium crankarm construction, which means that riders can benefit from its exceptional stiffness & strength without adding any unnecessary weight to their ride. FSA has also equipped this model with two aluminium chainrings that have been put through a CNC-machining process. By CNC-machining each chainring, any excess material has been carefully removed while still maintaining maximum durability. This results in a lighter overall weight as well as fantastic strength on your adventures. Coming complete with aluminium hardware & a three-bolt pattern, this is a great choice of upgrade for fast, smooth & dependable off-road performance. Manufacturer's Part Numbers: 310-0429 Black 42/27T 175mm SRAM 310-0441 Black 40/28T 175mm Shimano