Luxilon ALU Power is one of the most popular strings on the ATP Tour. An extra fine, superior durability string which combines impressive power with great control and feel. Its characteristics also include no noticeable tension loss, less plastic deformation than most polyester strings. CompositionCo ploymer Nylon, Flucarbon resin, aluminum fibersGauge16LLength726'Durability8.66Playability6.9TypeCo PolyesterTensionString 10% less tension than rec.