WIlson's [K] Pro Tour is a lower-mid-range racquet designed for competitive players and those who tend to swing heavily. It has a smaller headsize than many of the [K] models to increase precision, and has added weight. The only [K] Factor features that this racquet employs is the "Karophite Black" frame construction material, which is supposed to aid in the structural integrity of the frame graphite. The Pro Tour has a 24 mm cross-section with a 16 x 20 string pattern and one of its main features is stability. Comes in grip sizes 2-5.