FCS II Lost MB Performance Glass Split Keel Quad Surfboard Fins - SmokeThe FCS II Lost MB PG Split Keel Quad Fin Set adds bite and control to hybrid boards with wide tails, without sacrificing pivoting capabilities. Overview: Matt 'Mayhem' Biolos's specialty quad fin set. High area quad keel set adds bite and control to hybrid boards with wide tails, without sacrificing pivoting capabilities. Board Types: Designed to fit the FCS II Fin System. Recommended for all board types including modern fish and hybrid models with