This is a replacement or upgrade Shimano Chainring for Dura-Ace 9000 11-speed cranks. This chainring is also compatible with 11-speed Ultegra cranksets but will not match the color.
Chainrings should only be paired in appropriate teeth configurations with outer rings as follows:
Chainring BCD: 110 Asym
Ring Position: Outer
Chain Compatibility: Shimano 11
Intended Use: 54/42