The Head Instinct 25 is the perfect first racquet for any youngster today! Great junior racquet for kids between the ages of 6 & 9. Specifications: For ages 8-10 and 45-49 inches in height. Lightweight with large sweetspot 107 sq. in. 19mm O-Beam. 7.3 oz. Synthetic grip Grip Size: 3 3/4" Pre-Strung by the manufacturer.