Head Challenge Pro Tennis Racket AW15, Grip Size- Grip 3: 4 3/8 inch The heaviest of the Challenge series, the CHALLENGE PRO is the perfect choice for aggressive hobby players who need a heavier racquet on the court. With its youthful and sportive design, the PRO delivers the perfect mix of power and control to get the most out of your serious weekend game. Racquet is strung with Synethetic Gut at the middle of the recommended tension range. Head Size: 100 sq. inches / 645 cm Length: 27 inches / 68.5 cm Weight (unstrung): 10.5 oz / 295 grams Weight (strung): 11.0 oz / 311 grams