The Absolute Black Shimano 110/4 BCD Oval Chainring is designed for Shimano cranks like Dura-Ace 9000, Ultegra 6800, 105- 5800 and others. These are finest oval chainrings on the market in terms of shifting, smoothness of pedaling and manufacturing quality. Not compatible with FSA cranks. Absolute Black Shimano 110/4 BCD Oval Chainring Features Compatibility: Shimano Dura-Ace 9000, Ultegra 6800, Shimano 105 5800, Tiagra 4700. Compatible with Di2 & Pioneer, SRM and other power meters Material: CNC machined 7075 Txxx Aluminum. Long-lasting construction. Mounting: 110 BCD x 4 Over 15% stiffer than Rotor Qrings due to thicker, 5mm construction Bespoke Absolute Black 6 point ramp and recess shifting design shifts better than any other brand and model of oval chainring Finest design that provides excellent strength to weight ratio You will not feel the oval shape while pedaling Your pedaling action will feel smoother