The O3 Tour is the fastest racquet on tour is available in three headsizes. The choice of touring pro Nikolay Davydenko and more than 45 other touring pros, the O3 is the only technology to combine a larger sweet spot in a faster frame. Incorporating this into a thinner beam design has created a very deadly combination of sweet spot and speed! The O3 Tour has a huge sweet spot for an 18mm cross section (yes, that's correct 18mm at the tip and shaft, 20mm at midspan) thanks to Total String Freedom provided by the giant O-Ports. Product Reviews: �€�This racquet is great. It flows through the air smoothly and can bring an exceptional amount of spin, power and control when needed on serves or groundstrokes. Volleying with this racquet proved to be great when blending its manueverability and one's own strength together. This racquet would be a perfect 10 if it packed a little bit more punch when receiving heavy shots on volleys and from serves.�€� - Franco, Toronto, ON, Canada