| Spec | Diadem Axis 100 | Wilson Ultra 99 Pro |
|---|---|---|
| Weight (unstrung) | 295g | 305g |
| Head Size | 100 sq in | 99 sq in |
| Balance | Head Light | Head Light |
| String Pattern | 16x19 | 16x18 |
| Swingweight | 305 | 330 |
| RA Stiffness | 63 | 71 |
| Strung Weight | 320g | 330g |
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