| Spec | Wilson Shift 99 Pro | Wilson Steam 100 BLX |
|---|---|---|
| Weight (unstrung) | 320g | 300g |
| Head Size | 99 sq in | 100 sq in |
| Balance | Head Light | Head Light |
| String Pattern | 16x19 | 16x19 |
| Swingweight | 343 | 318 |
| RA Stiffness | 72 | 67 |
| Strung Weight | 345g | 325g |
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