Gamma Sports, a leading Sporting Goods Manufacturer, offers the best tennis strings and grips in the industry, along with a full line of training, court and stringing equipment. We are also excited to be at the leading edge of AmericaÕs fastest growing sport Ð pickleball! Located along the beautiful Allegheny River in Pittsburgh Pennsylvania, our facility includes a state of the art research and development lab and onsite courts for product testing (and a bit of friendly competition among employees).