Stainless steel thick ring available in 2 sizes. The width is 20mm/0.8" and depth is 9mm/0.3" at widest. They are smooth rounded and weigh 7.6 oz. Very heavy and sturdy. Inner and outer diameters vary as follows
A. 44mm/1.75" inner diameter
B. 50mm/2" inner diameter and 69mm/2.7" outer diameter