Futures F8 Blackstix 3.0 Tri Fin Set. Fin Set Up: Thruster. Fin System: Futures. Springy and responsive flex. The F8 Blackstix fin is one of the most balanced templates we offer and the largest in our Blackstix lineup. The springy flex pattern of the Blackstix construction combined with the V2 Foil give this fin a lively feel making it an ideal choice for generating speed and increased drive in smaller waves while the thicker tip provides hold when you're on rail. Stiff base for increased drive. More snap in the tip. Fiberglass. Compatible: Futures. Vendor style #: 457542100. Fin Specs: Size: Large. Rider''s Weight: 80kg + Side Fins: Base: 4.47. Depth: 4.64". Area: 15.90". Construction: Unconditional Carbon Fibre."