Chinese Knotting Cord is a round nylon cord that is braided for strength. It has a core cord running through its center which helps to maintain the cord's stiffness and round shape. Chinese Knotting Cord holds knots tightly with a beautiful grip, and its ends can be sealed with a flame. Use Chinese Knotting Cord for friendship bracelets, charm chains, drawstrings, even fringe! It comes in lots of fun colors, and each bobbin is 20 yards. This is the .4-mm size; also available in a 1-mm and 1.4-mm size.