Rat tail or rattail comes in two versions. The original is a U.S. made shiny smooth cord in rayon with a cotton center. The Chinese version is nylon made and can be heat-sealed, which is not the case with rayon. They can both be used as necklace cord using large hole beads such as dune beads' ceramics or Czech beads, but also for Chinese ornamental knotting, Celtic & macramé braiding and kumihimo. At that we could add that our rayon cord seems to drape better.