HRP Ring Size Table
| HRP Size | Small | Medium | Large |
| Internal Diameter (mm) | 16.40 | 17.18 | 17.97 |
| Internal Circumference (mm) | 51.30 | 54.00 | 56.45 |
| British UK | L | N | P |
| Europe | 11.30 | 14.00 | 16.45 |
| Japan | 11 | 14 | 16 |
| USA | 6 | 7 | 7.75 |
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