[K] Factor is really four different technologies from Wilson.

[K] arophite Black - A proprietary next generation structure created through a unique process at the nanoscopic level resulting in more feel and a stronger more stable feel and a stronger more stable racquet.

[K] Zone - a combination of turbo tubes and power holes for increased stability and power

[K]ontour Frame - Enhanced turbo tube design in the throat of the racquet for improved torsional stability. Maximum stability equals maximum power and [K]ontrol.

[K]ontrolled Power - [K] Factor frame design combined with wilson's exclusive power string technology delivers (K)rushing power without sacrificing [K]ontrol.

All these result in increased feel , more strength and stability and [K]rushing power.