This TUSA, Scubapro and Oceanic fin strap is a full assembly, including the buckles to fit on the fins, the quick release buckles that clip into the ones on the fin and the rubber strap itself.

The fin straps use the exact same buckle system, so the strap will fit fins of all three brands as well as many other brands which have the standard size "side prong" on the fin.

These are an essential part of any diver's spares kit, especially when going on trips away! You don't want to miss a dive, because you're not carrying a spare!