You're just upgrading your crankset with Rotor's oval chainrings, and the Rotor Shimano Screw Cover Set is the final piece of the puzzle to completing that speedy ovalized look. The Dura-Ace covers pair seamlessly with your Dura-Ace 9000 crankset, while the Ultegra option will work with both Ultegra 6800 and 105 5800 cranksets to get you out on the road and efficiently spinning the pedals.