This product is a tennis string (strung). This is a single piece package】 EHTER (emerald blue) square string designed for intermediate and advanced users. Designed for those who want to get their track in the game, or just want to play with a soft touch! Polyester string designed for "intermediate and up" players If you are looking for a "polyester string" with a 120mm gauge but want a "soft touch" would be the perfect string for you. Product Overview: Material: Co-polyester; Gauge: 5.7 gal (17 L) / 0.05 inches (1.20 mm); Length: 52.8 ft (13.4 m); Color: Emerald Blue.