ProKennex Ki Q+ 5 Pro (310) The Pro Kennex KI Q+5 PRO (310) 2019 provides premium performance elements like impressive power, reduced shock, vibration, and less torque. The mid plus Q+5 PRO tennis racquet is a great choice for players with a faster, longer swing speed who want a slightly heavier frame in the 310 g version. Key Features: Features a mid-size head (100 sq. in.) and a standard length. Features new Q Shape frame architecture designed to optimize the kinetic effect. "+" is the 25% increase in Kinetic Energy Chambers for less shock, vibration, and torque. Quadfocus System offers a "cornered" expansion of the sweet spot for more power and spin.