The C-Lon Tex 400 is the next step up in thickness from C-Lon Bead Cord. It is a 3 ply twisted multifilament Nylon cord with a diameter of approximately 0.9mm. It has a high breaking strength which means that your beaded Kumihimo creations should be long-lasting. I use the C-Lon Tex 400 as a stand alone braiding fiber as well