Pro Supex's Blue Gear was designed and engineered to put extra spin on the ball. Blue Gear's unique profile is up to 8 times more abrasive than other hexagonal or deformed string profiles. Blue Gear will bite into the ball like no other string, allowing the aggressive baseliner to create heavy spin which in turn will transfer all the power and torque into the ball. Blue Gear's exclusive "Spin Enhancing Technology (S.E.T) will provide so much spin that your opponent will be blown away! Why else choose Pro Supex Blue Gear? Blue Gear features a rough surface in addition to the unique profile which will grab the ball and produce more spin than other hexagonal shaped strings. The 17 gauge is for the player who is seeking even more pop and spin production without the loss of control.