Flat Japanese Crystal Elastic Stretch Thread, for Bracelets Gemstone Jewelry Making Beading Craft, BrownSize: about 0.5mm thick, about 328 yards(300m)/roll.âThis bracelet string is made of elastic spandex, which is sturdy for use and beautiful looking. âThe elastic cord is perfect for bracelet, necklace, bead weaving and other jewelry craft projects. Especially fit for using with seed beads, gemstone beads, glass beads and other beads for jewelry making.