FCS II Mid Carver Performance Glass Extra Large Thruster Fins ClearClean and understated in appearance, yet modest in reliability and performance. Solid fiberglass material combined with two proven templates. This set just works and allows you to trim, turn and feel the smooth groove on any midlength. Overview The Midlength thruster set was designed for boards set up with a standard thruster configuration. The set is made up of the Carver XL side fins which produce exception drive and hold, and the Performer Large