Wilson RF 01 Future Strung Performance Tennis Racket - Grip Size 3-4 3/8", Strung with Sensation 16 Natural at Mid Range Tension Racket comes strung with Sensation 16 Natural at Mid Range Tension; SABR Frame Design: Created in collaboration with RF for excellent performance versatility, allowing for pace, spin, and direction changes, which are a signature of his all-around style. Tennis Racket comes strung