Compatible with FUTURE plugs The strongest small-wave! Twin keel fins Model: SW (Swallow) 【Features of Keel Fins】Overall wide for stability. ★SW (Swallow) The fin shape is like a swallow's wings, with the top of the fin extending backward and flexing flexibly. Also, this length to the rear prevents the fin from unintentionally finning out during top action. It makes it easier to turn the board when ripping, so try hitting it hard. In addition, slits are moderately placed at the base of the fin, designed to disperse water flow and allow for flexible movement. Suitable for small waves and powerless conditions. If you have keel fins and feel they are heavy, try these. This is a very easy-to-ride, friendly twin fin design. Anyone can ride it without any discomfort. Recommended for surfers who want to draw smooth lines unique to twin fins! 〈Wave Size Compatibility〉 Small waves (knee-high to chest-high) ●●●●● Medium waves (chest-high to shoulder-high) ●●●●○ Large waves (head-high to double overhead) ●●○○○ 〈Performance Evaluation〉 Action ●●●●● Drive ●●●○○ Speed ●●●●○ Set them on your board and glide while feeling a new feeling! I hope you enjoy the fun of twin fins. Brand new, unused. Shipping included. ◆Product Description◆ Honeycomb core, lightweight design, using black cloth Made with high-quality materials, carefully crafted by fin artisans. ※Please understand that there may be minor scratches from sanding. Search terms Quiksilver, Billabong, Hurley, JS, Dakine, Al Merrick, Surfing, Surfboard, Rip Curl, Wet, Deck Pad, Placebo, Lost, Shortboard, Firewire, Justice, Lost, Al Merrick, FCSⅡ, Twin Fin, Keel Fin, Tri Fin, Quad, Rob Machado, FCS, FCS2, FUTURE, Futures Fin System/Fin Box...FUTURES