Campagnolo Centaur 11 speed rear mech is designed to work with the cable pull of campagnolo 11 speed powershift centaur shifters only. Nothing else in the Campagnolo range will work. The derailleur is only designed to work properly with cassettes with an 11T or 12T start cog and a 29T to 32T final sprocket in the cassette. Therefore only a medium cage derailleur is offered. There is a silver and black finish.