SODIAL(R) 20 M Spool of Crystal Clear Strong & Stretchy Elastic Cord Stringing 0.5mm Strong and stretchy elastic cord is a nylon based product that can be stretched and then returns back to its original length. This cord is normally used as a base for bracelets. Great for all your jewelry and craft making needs Material: Stretch Nylon Cord Length: 18m approx ,Diameter: 0.5mm approx