ProKennex Ki 15 (260G) Enjoy strong and comfortable swings with the ProKennex Kinetic Ionic 15 tennis racquet. Vibration dampening technology in this racquet absorbs impact to prevent arm fatigue. Players who want both spin and power will find what they seek from this racquet's extended length and oversized head. Racquet technology Advanced Timing System: Chambers with Secondary Mass, engineered to load kinetic energy during swing; precision tuned to release a counterforce at the moment of ball impact. Active Damping System: As the ball leaves the frame, the Secondary Mass inside chambers become active dampeners, limiting the peak and duration of negative vibration for a comfortable feel. Kinetic Comfort Cap: Uses NOPD (Non-obstructive particle dampening) to attenuate any residual vibration, significantly reducing hand and forearm fatigue.