1pc Size: Approx. 15.5 x 10.5 mm (+/- 0.5 mm) Ball part: Approx. 3 mm Width of mounting part: Approx. 3 mm Ring: Gauge 0.5 x outer diameter Approx. 2.5 mm (closed type) (*Please note that the size indicated may differ depending on how you measure, so please use this as a guide only.) Silver 925, Rhodium Plated Coating