Round chainrings for non-hidden bolt 5x110BCD cranks- Features (6) up-shifting ramps (outer ring) and (12) down-shifting points (outer ring)- Compatibility: Shimano Dura-Ace 7950, Ultegra 6750, Shimano 105- 5750, Tiagra 4650, FSA, Praxis, Rotor 3D & 3D+, S-works and many more 5 bolt cranks. Also fits SRAM Force and Red but NOT compatible with SRAM cranks that have 1 hidden chainring bolt (Force22, Red22)- Compatible with Di2. 10 / 11 / 12sp compatible- For outer chainring please order long bolts. Changing inner chainring only? Use original bolts- Designed in UK, manufactured in Poland