The HEAD(R) Sonic Pro(TM) Racquet String offers superior control and touch for extra pop and spin every time you make contact with the tennis ball. This exceptionally durable polyester string provides excellent response and playability so you can stay on top of the competition game after game. ** Learn more about Racquet Stringing Services available at select DICK's Sporting Goods locations ** FEATURES: Ultra-durable co-polymer polyester tennis string Designed for maximum control and touch Length: 40' / 12 m Gauge: 16 / 1.30 mm Model: 281028 HEAD