Dorsal Performance Flexrez Core Surfboard Quad Surf Fins (4) FCS Compatible Clear FlexRez Quad Surfboard Fins Set - Clear These fins suit performance short boards with fcs style plugs and fish and guns. Symmetrical rear fins create smoother rail-to-rail transitions in a variety of conditions. Rear GL style fins are asymmetrical side foils (as opposed to center foils) for tighter arcs and pocket surfing. FlexRez is the DORSAL material formulation created to capture the flex and memory properties of laminated fiberglass in a fin that is manufactured using injection molding tec DORSAL can create complex templates with precision and ensure consistent quality in every fin. Its also least expensive way to manufacture fins so the prices reflect that. These sizes cater for all surfers in all round conditions. Front: Base: 4.28in. Depth: 4.41in. Area: 14.22sq.in. Rear: Base: 3.86in. Depth: 3.93in. Area: 11.07sq.in.