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| UK | United States | Asia | Diameter (mm) | Circumference (mm) |
| K (small) | 5 1/4 | 9 1/2 | 15.9 | 50 |
| M (medium) | 6 1/4 | 12 | 16.7 | 52.5 |
| O (large) | 7 1/4 | 14 1/2 | 17.5 | 55.1 |
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Returns
Exchange of goods within 7 days of receipt.