FCS II SPLIT KEEL QUAD FINS - CLEAR GLASSFCS II SPLIT KEEL QUAD FINS CLEAR PEFROMANCE GLASS $199. 95 High area specialty quad set adds bite and control without sacrificing pivot. Upright keel template designed for traditional fish shapes. Overview Specialty split keel 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