Pacific Vibrations Surfboard fins High quality low cost surfboard fins Material: Fiberglass black Fits Perfectly in your FCS fin boxes Designed specifically for the classic, wide-tailed retro board the Controller is effectively a split keel and offers a unique blend of twin and quad characteristics. The fiberglass material, foil and large surface area create both maximum drive and control while the upright template will have a skatey feel in smaller conditions. Front Fins Base: 5.25" Depth: 4.50" Rear Fins Rear Base: 3.90" Rear Depth: 4.50" Rear Foil: 80/20 Comes with fin key