1Polyester String: Adopts new polyester material, durable with excellent control, resin material has been added to enhance the strength and elasticity, suitable for long term use. 2Wide Application: Belongs to the kind of primary round hard line with high resistance to hitting, able to reduce the risk of injury, suitable for all kinds of people. 3Application Range: Designed for offensive players with high durability, suitable for elevated players to improve your level and performance, making you feel ease during use. 4Long Length: Our string reel has about 200m/218.7yd long wire, can be applied for 1619 times, enough for long term use, improving your using experience. 5Easy to Use: This tennis string can be installed within a short time, simple for installation and removal, will not take much effort or time, time and energy saving.