This is the Riffe/DiveR FIBERGLASS Fins DIGI-TEK MEDIUM Stiffness Spearfishing Features: Length 35 in. (89cm) Veloc Foot Pocket Custom epoxy resin system and aerospace grade fabrics produce a fin that transfers load progressively from toe to heel. RIFFE has partnered with renowned top of the line fin blade manufacturer DiveR. Custom epoxy resin system and aerospace grade fabrics produce a fin that transfers load progressively from toe to heel. Fiberglass blades are produced with a medium hardness for optimum performance. Also compatible with Omer stingray, Mares Razor, and Salvimar foot pockets. Will fit Pathos and Beuchat with slight modifications (shave off a portion of the rail that overlaps the fin tendon and glue in instead of drilling and using mounting hardware.)"