Futures F8 Blackstix Tri Fin Set - Large/GreenFutures Blackstix fins feature a V2 inside foil that generates and maintains speed throughout turns. The precision carbon and fiberglass matrix construction paired with specialized epoxy resin provides a very lightweight fin with incredible response, making your board feel livelier. Features: Template Category Neutral (all around versatile) Construction Blackstix Ride Number Speed Generating 8. 7 Suggested Wave Type All types All conditions Size Large