HRP Ring Size Table
| HRP Size | Small | Medium | Large | X Large |
| Internal Diameter (mm) | 16.79 | 17.58 | 18.36 | 18.76 |
| Internal Circumference (mm) | 52.56 | 55.00 | 57.77 | 59.00 |
| British UK | M | O | Q | R |
| Europe | 12.56 | 15 | 17.77 | 19.00 |
| Japan | 12 | 15 | 17 | 18 |
| USA | 6.25 | 7.25 | 8.25 | 8.75 |
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