Babolat Pure Aero Tennis Racket This version is known as the USA Stars and Stripes model. Inspired by the U.S. ATP Pro, Jack Sock! String Pattern: 16 by 20 The racket has a 4 3/8" grip size and is made by the trusted brand Babolat. This Pure Aero is known for its great power and superb spin production. The quality of the racket speaks for itself. Perfect for any high-level player looking for a reliable Tennis Weapon! It has Woofer System Design.