Fusing Secret - Use Fiber Rope Use twisted fiber rope to keep openings in jewelry, wind chimes, and other projects while firing. Overall rope diameter is 3/8". Untwist into 3 pieces each with a diameter of 1/4". Untwist those 3 pieces and each strand is 1/8" in diameter. So versatile - you get so many diameters out of one piece so you always have the right size for the project you're working on.