Yonex Dynawire 16 1.30 Tennis String Packages White/Silver : The new Yonex Dynawire 16 1.30 tennis string is a ultra-playability of this nylon monofilament. This string is designed with a special metal film and is perfect for intermediate level players looking for string with excellent power and durability. Features a nylon monofilament core with a metal film and winding nylon wraps. Generates sharp repulsion with premium durability.