Wilson Natural Gut 16 Tennis String Single Set 1.30mm Natural WRZ999800 - Used by Kei Nishikori

---------------------------------------------------------------------- A natural gut that focuses on the traditional "natural" feeling, providing high holding performance and a pleasant hitting sound. Type: Natural gut Single sheet (length: 12.2m) Gauge (thickness): 1.30mm Material: Organic Grass-Fed Cow Color: Natural Made in Belgium