If you want a Rotor ring because of the high quality machining and anodization but are not fond of the ovalized profile, this chainring if for you. It has the same features and finish of the Q-Rings except it is completely round. profiled teeth aid shifting and durable finish adds longevity. Works with all 10 speed drivetrains and mounts to most 130mm BCD cranksets. Best when paired with a Rotor outer chainring.