Strong & Stretchy. This is the strongest of the stretchy cords, and the thickest. Great for almost all glass beads. But if you're using the tiniest seed beads or small gemstones or freshwater pearls, use one of the thinner stretchy cords Diagram for making the knots is on the back of the package. We recommend gluing the knot with Hypo Cement or other glue so the knot doesn't come undone.