100 square inch tennis racket made of graphite and magnesium, 16x19 string pattern. Grip G2 - Material: Graphite, Magnesium, Wood - Size: ACE SIZE 100 square inches - String Pattern: 16x19 - Country of Manufacture: Japan Thank you for viewing. I used it for about 2 years and kept it as a spare racket. I haven't used it since replacing the grip tape. The strings haven't been restrung for over a year.