Superlon, S-Lon, and C-Lon are brand names for the same product, a plied and bonded nylon string that is very popular for use in kumihimo and other jewelry braiding.
The product is made at the same factory, on the same equipment, and to the same specifications; the only difference is that C-Lon is a taller spool than S-Lon/Superlon and C-Lon has more yardage on each spool. Other uses for this material are in upholstery and fabric trims like top-stitching on shoes and purses.
Tex 135 Fine cord has a diameter of 0.4 mm. It is good for braiding with size 11/0 seed beads, smaller shaped seed beads, freshwater pearls, and other beads with smaller than average holes.