The Wilson NXT Tennis String is the world's most popular multifilament string featuring a thinner gauge for more power and spin, at the expense of some durability. This string has numerous followers thanks to its combination of comfort and playability. The addition of the patented Dupont Xycro Micro-Fibers helps to increase the sweetspot size and reduce vibration for greater arm comfort. Rated the #1 synthetic in playability by the USRSA in 1999, this string has remained popular and continues to gain new followers. The multifilament construction is coated with a polyurethane resin coating to seal the delicate fibers to enhance durability. The resin material also helps to soften the feel of the string, providing comfort and power. This is a great string to try for anyone with tennis elbow, as well as anyone seeking natural gut like performance from a synthetic construction.