Wilson Champions Choice is a hybrid of Wilson Natural Gut and Luxilon Alu Power Rough.Combining the playability of natural gut with the durability, spin and control of Luxilon Alu Power Rough gives the player the best of both worlds. For a softer feel,playability and increased spin, use the Wilson Natural Gut in the mains.For durability and control, use the Luxilon Alu Power Rough in the mains.