The spierre 100% pure carbon fibre blades have been meticulously researched and each pair is handcrafted, with the freediver/spearo in mind, who takes the challenge of deep diving seriously. The blades are of a gradual power type, manufactured from various layers of carbon, positioned to form a gradual bend. This facilitates a powerful thrust whilst conserving valuable energy for the diver. Using only 100% carbon fibre, provides these fins with the best return to original position (memory) than any other material on the market. Together with high quality epoxy resins, the carbon fibre combines to form a strong and durable blade. It will fit most standard rubber foot pockets