The hybrid Wilson Duo Control tennis string offers a great pairing of Luxilon 4G Rough and Wilson NXT Control for awesome spin and precision. This perfect blend provides increased bite on the ball for long-lasting, high-level play. The gold colored 4G Rough string is composed of co-polymer monofilament with a dented surface that provides spin and comfort. The natural colored NXT Control string provides comfort and control with its multifilament composition. Either string can be installed in the mains for superior control and performance.