Surf My Wave Surfboard Fins FCS Base Glass Nylon Thruster Set Black G5 Size+Free Fins Keys and Screws HIGH PERFIRMANCE AND REASONABLE PRICE: Strong Glass Flex fins with Fiberglass reinforced Nylon construction,high quality with lower price. FCS G5 SIZE BLACK COLORS: This is thruster set fins, actually they are tiny bit smaller than G5 size, good for a rider that is at a beginner to intermediate level because they allow for good turning and down the line drive. It also creates a curve that evenly distributes any extreme impact force. COMMON FCS BASE FINS DEVELOP POWER ENERGY: High quality performance core, stable control your surfboard when you surf,give you the optimum combination of strength and flex in your fins. GET FREE FCS FIN KEYS AND SCREWS: We send you 1 KEY and 6 SCREWS with this fin set,make surfers enjoy your purchase on Amazon.