Spring Fin Straps Stainless Steel for ScubaPro Jet Fins Fin Scuba Dive Diving Diver Spring Fin Straps Stainless Steel for ScubaPro Jet Fins Designed to work with Jet Fins - Stainless steel clips - Black only Small - (attach point on fin to attch point on fin) unstretched 10.00", max stretch 14.00" Medium - unstretched 11.25", max stretch 17.50" Large - unstretched 13.25", max stretch 20.00"