TRP CR-M9050 Boost Direct Mount Chainring - 32t 12-Speed CINCH Mount 3mm Offset 7075-T6 Aluminum Sandblasted BLK/Space GrayTRP CR M9050 Boost Direct Mount Chainring 32t 12 Speed CINCH Mount 3mm Offset 7075 T6 Aluminum Sandblasted Black Space Gray. The CR M9050 EVO12 Boost chainring is crafted with high quality CNC machined 7075 T6 aluminum and features Wave Technology for proven chain retention in extreme conditions. CNC machined using 7075 T6 aluminum provides strength and incredible durability Torsionally rigid for exceptional power transfer Wave Technology offers