The ProKennex Ionic Ki 5 PSE tennis racquet isnbsp;a pro version of the original Ionic Ki 5 having more weight. The heavy is ideal for advanced players who are able to generate their own power and have a long fluid stroke. The 100 square inch headsize works well with the heavy weight to add extra power and stability on shots. The Ionic Ki 5nbsp;PSE tennis racquet has a 16x20 string pattern allowing for more bite on the ball to generate plenty of spin on shots.nbsp;In the frame of the Ionic Ki 5nbsp;PSE is the Ionic Technology an improvement on the famed Kinetic Technology. The Ionic Technology uses Jetron filled chambers to negate the charges presented when the ball makes contact with the stringbed. The neutralized charge provide players with a solid feel and improved power and control. The Kinetic Technology still increase the ball dwell time allowing players to add extra spin on their shots. The Active Dampening System also reduces the amount of vibration and shock for a comfortable feel. The heavy weight midplus headsize and open string pattern all make the ProKennex Ionic Ki 5 PSE is great racquet choice for advanced players looking for more control and comfort in their shots.For more information on Choosing a Tennis Racquet or Selecting String please see the Tennis Express Buyer|S|s Guide.