This is called a “gear tie” in the non-soap world, but to us it’s a hanger tool used to make delicate hanger swirls. Having one that is adjustable to different mold lengths makes this one versatile as well as useful. It is made from strong black rubber with a re-shapeable wire inside. The ends have secured caps for safety. After using it to make your designs, wash well and let dry.
To see the gear tie in action, most of my videos use it: