This is the SPEARPRO PURE CARBON BLADES (SOFT, MEDIUM) FOR SPEARFISHING Features: Pure Carbon (100% carbon+epoxy) .- Blade is made from a high quality of epoxy resins mixture and carbon. Compatible with the SpearPro Genesis footpockets, Pathos Fireblade footpockets and CETMA S-Wing footpockets. Fins dimensions with foot pockets size 43-44 ~ 95 cm long x 20 cm wide. Angle 20 degrees Rubber rails attached to the blade provide maximum efficiency in water flow. redirection. Pair of fins weight ~ 4lb (Medium stiffness, foot size 43-44). Foot pockets and mounting kit sold separately