This is the OMER Stingray EVO Long Blade Freediving Spearfishing Fins Features: Long fins for freediving and spearfishing. The new color makes them visible on the surface and camouflage on rocky and sandy bottoms. 22-degree downturned blade. The keyhole improves its performance by channeling water and guiding the blade during movement. Long fins for freediving and spearfishing. The new color makes them visible on the surface and camouflage on rocky and sandy bottoms. 22-degree downturned blade. The keyhole improves its performance by channeling water and guiding the blade during movement. In addition, the hole also serves to decrease the force needed to move the fin in the less active area of the blade. These Fins are wider than average and provide a highthrust. An oval water channel is placed in the low-flexzone that increases the hydrodynamic efficiency without sacrificing any thrust. Use less muscle power for more propelling force!