Wilson Revolve Spin 17 Gauge Green Color Poly (Polymer) Tennis String 2-Pack (2 Sets Per Order) - Best String for Durability and Spin

There’s nothing quite like the feel of Wilson’s Revolve Spin Poly String. Wilson has developed a polymer tennis racket string that lasts exponentally longer than a synthetic gut, and because of its pentagonal shape (5-sided) with ridges that bite into the ball, your ground strokes will have more revolutions per second (aka SPIN!) than normal. This string is perfect for big hitters who really hit out on the ball and like the extra spin for penetrating groundies.