Just in case. The last thing you want is to fish around on the bottom in knee deep freezing cold water looking for your lost carabiner. The patented Doc's Hunt N Stuff Carabiner Floats are made with 3 inch solid round Styrofoam and 400 pound monofilament line. If you drop it, it will float right on the surface. Just put a finger through the 2 inch loop and pick it up.