ProKennex Black Ace (300G) The ProKennex Black Ace 300G provides the perfect balance between power and flexibility on the court. This tennis racquet uses Spiral Tech graphite filaments to provide maneuverability and acceleration. Enjoy an exceptional feel from the Kinetic System's stabilizing torsion in the frame. The shoulder's trapezoid shape grows out of the handle in harmony with the oval shape of the head, creating a clean impact with the ball. For players who want to perform at full power without sacrificing precision, take a swing with the ProKennex Black Ace 300G! Racquet Technology Advanced Kinetics: Improved racquet feedback enhances the player's ability to paint the court with an array of shots. FlexLogic: Bending profiles hold the ball longer with reduced head deformation, giving the shot maker additional time to keep their opponent guessing. Racquet Sense: Improves head stability, raises COP, increases dwell time to deliver on-target shots. Arm Protection: Guards the player from fatigue and injury.