Inspired by the one of the world's strongest and softest natural fibers, Silk offers players the utmost in power and comfort, thanks to its ultra premium polyurethane-injected multifilament construction. The gut-like playability and comfort, combined with unsurpassed tension maintenance offers players of all levels a feel as smooth as Silk. Pure DuPont PA66 multifilament central core, Fibers bonded with thermo elastic PU resin, Super bonded polymer outer coating.