This is the JBL Heavy Duty Stainless Steel Tuna Clips for Rigging Spearfishing Floats Features: Heavy duty stainless steel clip For rigging spearfishing floats, floatlines and breakaway systems Available in small and large Large - 12.5 cm The use of a float system is required for large animal spear fishing. Once you have shot the fish either your gun is attached to a surface float with a line, or the line on your guns reel will pay out until the reel is empty. At that point the line and float take over and you are no longer attached to the line, spear and float. All you need to do is surface and once the fish stops fighting you can pull in the float and your prize.