The Wilson [K] Factor [K] Surge is a premier tennis racquet built for intermediate and advanced players at the 3.0 to 4.5 level. Truthfully, it is suited for almost anyone, as it is light, maneuverable, and very spin friendly. It delivers superior balance of power and control, yet is still heavy enough (10.3oz) for advanced players seeking a lot of spin and pace off a relatively short swing. Included also is Wilson’s Karophite Black technology, which delivers more feel and stability through nanoscopic-changes in the racquet frame. According to critics, the Wilson [K] Factor [K] Surge is highly recommended for intermediate players who are gradually approaching an advanced level; it allows for a weight increase and more expert-level techniques.