The X110 chainrings are compatible with the Shimano Dura Ace 9000/R9100, Ultegra 6800/8000 and 105 5800/R7000 11 speed chainsets.For complete compatibility you must replace both inner and outer with TA rings.Please note: these chainrings are designed to be compatible with the modern chainsets that have a cutout on one arm, they are also backwards compatible with the earlier chainsets that do not have the cutout.Features and Information* Material: 7075 T6 Aluminium, * Unique PCD: 110mm 4 arms.* Outer : 48, 49, 50, 51, 52, 53 teeth.* Inner : 33, 34, 36, 38, 39, 42 teeth.* Colour : Black.