Rainbow (Premium)
| US | UK | HK | Internal Diameter (Mm) | Circumference (Mm) |
| 5 | J 1/2 | 9 | 15.7 | 49.3 |
| 5.5 | K 1/2 | 10 | 16.1 | 50.6 |
| 6 | L 1/2 | 11 | 16.51 | 49.3 |
| 6.5 | M 1/2 | 13 | 16.92 | 51.9 |
| 7 | N 1/2 | 14 | 17.32 | 54.4 |
| 7.5 | O 1/2 | 15 | 17.73 | 55.7 |
| 8 | P 1/2 | 16 | 18.14 | 57 |
| 8.5 | Q 1/2 | 17 | 18.54 | 58.3 |
| 9 | R 1/2 | 18 | 18.95 | 59.5 |
| 9.5 | S 1/2 | 19 | 19.35 | 60.8 |
| 10 | T 1/2 | 20 | 19.7 | 62.1 |
| 10.5 | U 1/2 | 22 | 20.17 | 63.4 |
| 11 | V 1/2 | 23 | 20.57 | 64.6 |
| 11.5 | W 1/2 | 24 | 20.98 | 65.9 |
| 12 | X 1/2 | 25 | 21.39 | 67.2 |
．Assess an Existing Ring
1. Choose a ring you currently own that fits you well.
2. Gauge the internal diameter of the ring in millimeters.
．Determine Your Finger Size
1. Encircle the base of your finger with a string or a narrow strip of paper.
2. Indicate the point on the string or paper where it intersects.
3. Calculate the length of the string or paper in millimeters.
- Product only available in USA - Free Shipping
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Feel assured and ready with your Sentri ring, a versatile self-defense accessory boasting timeless design and genuine materials. Explore our Rainbow collection, showcasing rich colors such as Aquamarine (blue), Emerald (green), Onyx (black), Ruby (red), Amethyst (purple), and Chrome (multi-colored).
The Rainbow orbs threaded design is meticulously crafted for swift deployment, ensuring the 10mm blade is exposed in just under 2.5 rotations for immediate protection. All our rings are handmade in Los Angeles, California, exemplifying the highest quality materials and craftsmanship.