| Spec | Diadem Axis 98 | Wilson Ultra 99 Pro |
|---|---|---|
| Weight (unstrung) | 300g | 305g |
| Head Size | 98 sq in | 99 sq in |
| Balance | Head Light | Head Light |
| String Pattern | 16x19 | 16x18 |
| Swingweight | 313 | 330 |
| RA Stiffness | 65 | 71 |
| Strung Weight | 325g | 330g |
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