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Prince O3
Prince has once again revolutionized the art of racquet design with the launch of O3, a breakthrough in racquet engineering that allows you to hit your best shots more often. What's truly impressive is that the Prince engineers were able to do this all without enlarging the racquet  head, increasing its length, or adding weight!
o portO-Ports
By replacing traditional pin-sized string holes with revolutionary giant O-Port technology, a super aerodynamic frame has been created with a more responsive stringbed. This increases the sweet spot by 54%, creating a Sweet Zone, which means you hit your best shots.
sweet zone 
Sweet Zone Engineering
O-Ports increase the conventional sweet spot by 54%, turning it into a Sweet Zone. This eliminates the dead zone of the racquet and allows you to hit more powerful serves, more consistent shots and return wide shots with authority.
swing speed
Faster Swing Speeds
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.
greater stability 
Greater Stability
O3 engineered racquets are created through a one step fusion process that utilizes the strongest structure known to man, the Arch, creating the frame’s O-Ports. These O-Ports stabilize the racquet giving you more control on off-center shots.