【Product Name】Jean Paul Gaultier Crystal Double Ring 【Size】FREE / Height: approx. 3cm, Width: approx. 2.4cm, Ring Width (inside): approx. 1.9cm *Please note that these measurements are approximate due to manual measurement. As shown in the photos, it appears to be adjustable, but it's made of a sturdy material, and it would be difficult for an amateur to adjust the size themselves.