Japanese Flat Elastic Crystal String, Polyester Thread, for Stretch Bracelets Gemstone Jewelry Making, CeriseSize: about 0.5mm thick, about 65.6 yards(60m)/roll.âThis bracelet string is made of elastic polyester 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.