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Long fins intended for the spearfisher and the evolving freediver. Their color makes them visible on the surface and mimetic on rocky and sandy bottoms. 22 ° blade angle. The hole improves its performance by channeling the water and guiding the blade during movement. Furthermore, the hole also serves to decrease the force necessary for kicking in the less active area of the blade. The material with which they were designed has a high elastic modulus which makes them particularly effective.