Wilson k factor k-six one tour 90 (Federer)

This is the racquets choice of Roger Federer 2009
Midsize Specs
Head Size: 90 sq. in. / 581 sq. cm.
Length: 27 inches / 69 cm
Strung Weight: 320g
Balance: 9pts Head Light
Swing weight: 336
Stiffness: 67
Beam Width: 18 mm Straight Beam
Composition: 80% Karophite Black / 20% Kevlar
Power Level: Low
Swing Speed: Fast
Grip Type: Wilson Leather
String Pattern: 16 Mains / 19 Crosses
Mains skip: 7T, 9T, 7H, 9H One Piece No shared holes
String Tension: 50-60 pounds