Frame Weight: 125 g Head Size: 74.50 sq.in. Construction: 100% Graphite with TeXtreme X Twaron Balance: 330 mm String pattern: 16x17 Grip: Prince ResiPro Factory strung with: Prince SynGut Recommended String: Prince Lightning 17g Recommended Tension: 25 +/- 5lbs / 11 +/- 2kg Technologies: Power Ring / Air Handle / Textreme X Twaron RealSpec: Strung Weight: 164-166 g Balance Strung: Head-light, 349-352 mm Our test results: Prince Vortex Pro 650 did not disappoint in any respect - after all, how can you fail with the tried and proven Power Ring 16X17 design. Prince Vortex Pro felt more substantial, more solid than some other frames we tried. Head-light balance helped shot placement, and kept the sting in the attacking shots. We looked past the tight syngut strings, as we tried the racquet with all the best stuff in it. Cannot go wrong with this one.