| Spec | Head Speed Pro | Wilson Shift 99 |
|---|---|---|
| Weight (unstrung) | 310g | 305g |
| Head Size | 100 sq in | 99 sq in |
| Balance | Head Light | Head Light |
| String Pattern | 18x20 | 16x19 |
| Swingweight | 329 | 320 |
| RA Stiffness | 68 | 70 |
| Strung Weight | 335g | 330g |
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