Size guide
Rings use two sizing systems. Unsure? Message WhatsApp — wrong sizes can be exchanged within 14 days.
18 / 20 / 22 mm models
| Size | Fit |
|---|---|
| 18 mm | Slim finger, often women’s and youth fit. |
| 20 mm | Medium finger — the most chosen size. |
| 22 mm | Wider finger or a relaxed daily fit. |
US 8–13 models
QB806 Lite, QB806 Pro, SQ666, and QB708 use classic US ring sizes. Pick the size you already wear. Jood models include 18 / 20 / 22 mm adapters in the box.
How to measure at home
- Measure the inner diameter of a ring that already fits, in millimetres.
- Choose the closest of 18 / 20 / 22 mm; if in between, pick the more comfortable one.
- If you know your US size, mark 8–13 to match.
