PUNT SURF Futures Fin System - Carbon Ignition Fins with Key - Tri Fin Thruster Set [Blue] - Surf Board Short Future Shortboard Skegs Surfboard Stoke Guarantee: you'll be stoked with the performance, style and durability of these fins Resin transfer molding + carbon fiber = incredibly light, fast fins Base: 4.25in (108mm), Depth: 4.25in (108mm) Thruster Set - 3 Futures compatible fins About PUNT SURF: We're surfers from San Francisco, and our mission is to provide premium surf accessories for all. We love surfing, and we charge everyday whether it's ankle high or triple overhead surf. We surf our products in all conditions to make sure they're the best out there. We're confident you'll be stoked with our products!