Production of the material includes several stages: silk floss is spun into yarn by hand, with patterns added by hand-tying bundles of yarn before dyeing the yarn with indigo, then the silk is woven using a back-tension loom.
Andy Roddick has lowered his tension gradually from 63 and 64 pounds a few years back to 55 and 56 pounds at the U.S. Open, according to Prokes, his stringer.