absoluteBLACK Premium Shimano 110/4 bcd compatible oval chainrings are designed for new type of Shimano cranks Dura-Ace 9100, Ultegra 8000 & 105 R7000. Super fast shifting and amazing smoothness of pedaling. Material: cnc machined 7075 Txxx Aluminum Number of Rings: 1 Teeth: 53 Bolt Circle Diameter: 4 Compatible Components: Shimano Dura-Ace 9100, 10 / 11-speed Model ROV9100/53/4BK Brand Name absoluteBLACK Unit Count 1.0 Count Item Weight 0.39 Pounds Part Number ROV9100/53/4BK Strand Type Single Manufacturer absoluteBLACK Material Type cnc machined 7075 Txxx Aluminum Included Components Included as described Recommended Uses For Product Road biking, climbing, and long-distance cycling