Futures Fins - QD2 4.15 Blackstix 3.0 Quad Rear Fin Pair Quad Rear fin set (2 Rear Fins) Recommended for Large Size Surfers - 180lbs+ (80kg+) Futures Ride Number rating of 8.1 - Speed Generating For springy fluid and responsive surfing Area Specs - Quad Rears: 12.60sq in