The Luxilon Alu Power Diamond Anniversary 130 12m Set combines great durability with impressive power and amazing control. The co-poly construction of the string helps deliver outstanding control for faster swing speeds. It is the standard for playable durability in co-polyester tennis string. This version of ALU Power comes in a new, thicker 16G (1.30 mm) for more control and a slightly firmer feel. It allows players of all levels to take full cuts, creating generous amounts of spin without a loss of control.