Design size: Approx. 7.5 x 3 x 1.5 mm (+/- 0.5 mm, including ring) Post length: Approx. 10 mm Post gauge: Approx. 0.7 mm Ring hole size: Approx. 1 mm (does not open or close) Silver 925, Rhodium plated coating ("925" engraved on design, post and catch)