Kinetic Classic. A true baseliner's frame with lots of pop, due to racquet stiffness and 1/2" longer frame than standard. Adding a second energy soucre makes the difference. All racquets have a single energy source, the frame. ProKennex has developed a proven second energy source through its patented Kinetic System. The term "Kinetic Explosion," used to define the incomparable energy release that takes place in the Kinetic Series racquets, shot after shot, accurately describes the impact the technology is having on consumers. ProKennex feels a deep commitment to helping players with their game while at the same time increasing the longevity of their playing ability.With 56% incident of tennis elbow among tennis players, the market for this technology is in demand.