The Hope Mono M6 Small Bore Caps are colored inserts for the Mono M6 caliper. Priced for one insert. It fits the smaller bore cap hole on the caliper. Two of these + a Large M6 bore cap would be also be needed to fully outfit one Mono M6 Caliper. You would also need a Mono M6 small and large bore cap tool to install them - see our store - we sell it. Choice of Black, Blue, Gold, Red, Silver or Gun Metal Anodized.