Prince Ozone Seven OS Tennis Racquet (FR) Power Level 1000 Headsize 105 sq in Weight 10.1oz/285g unstrung Balance 13.0in/33.0cm, Head Light Length 27.25" Cross Section 23-25-23mm String Pattern 16 x 19 Swing Weight 295 String SynGut Multifilament 16 Grip DuraPro+ The OzoneSeven isa superb all-around Midplus+ frame, ideal for all level of players with longer and faster swings who want to deliver the ultimate in controlled power. The O-ports in the Ozone Series of racquets expand the conventional sweet spot by up to 54%, turning it into a sweet zone, allowing players to hit their best shots, More often. With Carbon Wave Matrix Construction, Prince has re-engineered the hitting zone adding extra strength and stability for a larger, more consistent sweetspot and maximum control. O-Ports reduce aerodynamic drag, producing a faster swing speed, enabling players to reach more balls and win more points, more often. A faster swing speed means increased power and maximum maneuverability.