Wilson K Factor KPro Staff 88 (2008)

Length 27 inches
Head size 88 sq
Weight Unstrung 12.3 oz / 348 grams (+/- 7 g)
Weight Strung 12.8 oz / 363 grams (+/- 7 g)
Unstrung Balance 9pts HL / 31.5cm (+/- 5%)
Strung Balance 6pts HL / 32.4cm (+/- 5%)
Swing weight Unstrung ≈315 (+/- 5%)
Swing weight ≈345 (+/- 5%)
Stiffness ≈67
Width 17mm Straight Beam
Material [K]arophite Black
String Pattern 16 Mains / 19 Crosses
Mains Skip

A classic that never was...

The Wilson K Factor KPro Staff 88 was designed for Pete Sampras post-retirement, combining classic Pro Staff DNA with modern K Factor technology for enhanced precision and responsiveness. With an 88 sq. in. head, thin box beam, 16×19 string pattern, and a hefty 12.8 oz strung weight, it offered exceptional stability, control, and feel. Its head-light balance made it a niche choice for advanced players seeking a heavy, traditional-style racket.

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