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✔ Slice smooth sweeping arcs in the waves, with the stiff flex and balanced template of these twin keel fins (similar template to Fu K2 Keel fins). Designed for twin-fin fish surfboards, both modern and retro boards. ✔ Includes twin keel fin, premium fin bag and fin key. ✔ Made of lightweight, high-strength Fiberglass. ✔ Base: 6.37 Height: 4.72 Riders can expect long drawn out turns, and great speed down the line. ✔ If you're anything like us then you love the speed you get from flying down the line on a fish. We made sure to give this fin plenty of base and area to get you moving faster than most! UPC 781828018117 ASIN B07ZV8VR6G Color black Fit Type Open-Heel Brand Name AQUBONA Sport Type Surfing Closure Type Open-Heel Manufacturer Shenzhen City Kangnuo Sports Equipment Co.,Ltd Model Number FCS2-Skull-au Material Type glassfiber Item Type Name surf fin Included Components key, screw Warranty Description 1 Age Range Description Adult Manufacturer Part Number RB-019A