- bowwwl
- Bowling Ball Database
- Brunswick
- Coverstocks
- ECA-XR Solid
ECA-XR Solid
Type
              Solid Reactive
          Balls with the Brunswick ECA-XR Solid Coverstock
| Ball | Release Date Sort ascending | Core | RG | Diff | MB Diff | US/Overseas Release | Discontinued | |
|---|---|---|---|---|---|---|---|---|
|   | Kingpin Rule | Kingpin Ultra Low RGAsymmetric | 2.483 | 0.055 | 0.020 | |||
|   | Quantum Bias | Quantum Mushroom High RG AsymmetricAsymmetric | 2.563 | 0.052 | 0.013 |