Color-match your Ultra V4 tennis racket with the beautiful and powerful ALU Power Ocean Blue tennis strings. This is the top string on tour for a reason - the aluminum present in the string enhances playability to go along with impressive power and control. Its unique poly-ether-ether composition exceeds all quality standards for near-zero string variance. Completely impervious to atmospheric conditions such as moisture, ALU Power delivers unrivaled consistent performance for championship-worthy results. The 1.25 mm gauge is slightly thinner than the 1.30, which generates enhanced feel and control on each shot.