The Surf Worx Proline Code 5-Fins Softboard from Adler has a high-density core with laminated wood stringers, a durable EBS deck skin and features a FCS compatible bolt through fin system. Product Information: • Product Code: SBSWP5604-BK • High Density Dynamic Core • 3 Multi Layered Resin coated Laminated Wood Stringers • High Density Polyurethane Slick Bottom (HDPE) • High Density Durable EBS Deck Skin • Comp Fin System (Bolt through FCS compatible)