Black Friday Special! Buy 1 Set of Tourna Big Hitter Black 7 Tennis String and Get 1 Set Free!! (Valid Nov 23st to Nov 26th Only) German engineered Copolyester String Seven sided design grabs the ball to generate impressive spin Mid-range power, incredible precision and comfort Copolyester composition provides durability as well as flexibility for a softer feel than traditional poly strings Available in 16g, 17g, and 18g. 40-foot sets. Tourna Tennis String BHBK7-17-B1G1