Prince AirO Reactor OS Tennis Racquets Headsize 110 sq in Weight 9.2oz/270g unstrung Balance 13.7in/34.7cm Length 27.0" Cross Section 25-27-25mm String Pattern 16 x 19 Composition Graphite Composite The AirO Reactor graphite racquet with AirO large grommet technology at 3 & 9 o'clock provides greater aerodynamics and increased sweet spot. AirO racquets feature large grommet technology for increased aerodynamics and a faster swing speed for added power along with lightweigt 7000 series aluminum Features a lightweight design with oversized head for easy playability and ultra-soft Prestrung with Prince Synthetic Gut 16g at mid range