Lvwa Bb Alu Rough 16l Tennis Racket String 660ft/200m Reel The durable and control oriented response of LVWA ALU and other LVWA co-polyester strings has revolutionized professional tennis. By far the most popular choice on the match, the co-polyester monofilament construction allows a player to take full cuts at the ball without any loss of control. Players with fast swing speeds also tend to find these strings very spin friendly. ALU Rough is textured to further enhance spin production. Gauge: 16L / 1.25mm  Length: 660 feet / 200m  Composition: Co-polymer nylon + Fluocarbon resin + aluminum fibers  Color: Grey Excellent durability  Power oriented  Good energy return  Excellent response