The Record 12 Speed inner chainring is an OE replacement for both the Super Record and Record 12 speed cranksets. The optimized bolt pattern is compatible with Campagnolo 12 speed cranksets only. As expected from a Record-level component, the chainrings are constructed of a hardened light weight alloy, machine cut and sculpted for strength and lateral stiffness. The teeth have been designed to match the 12 speed chain profile for optimal grip with low friction. The dark grey anodized finish adds to the overall durability as well as fighting corrosive elements and increasing longevity of the aluminum alloy.