The Record 12 Speed outer chainring is an OE replacement for the Record 12 crankset. 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