Prokennex Ki 5 280 Tennis Racket (Unstrung)The Ki 5 (280g) continues to offer an impressive combination of speed, comfort and precision. At 280 grams unstrung, this version of the Ki 5 is ideal for the intermediate player. Although it lacks the mass of the 300 and 320 grams version, this racket's near even balance gives it impressive stability for its weight class. Comfort is enhanced by the Kinetic Technology, which deploys dynamic mass in the head to reduce the amount of shock that reaches