Oval Concepts Carbon 900 Crankset made by FSA is nearly identical to the Aftermarket SLK Light Crankset.They have Hollow Carbon arms with UD Carbon finish, AL7075 100-percent CNC chainring, 53/39 and AL7075 Torx T-30 alloy chainring bolts. They will work with Sram and Shimano 10 and 11 speed. This crankset DOES NOT include the Bottom Bracket. It requires a 24mm beaing with MegaExo fitting.