Sterling Silver open jump rings made from twisted sterling silver wire. The diameter of the wire is American Gauge 20 which is approx 0.81mm. I wind the wire around a mandrel and saw cut it to make the rings. I then tumble polish the rings to smooth the cut edges and give them a nice shine. Key Details:~ Wire thickness 20 gauge (0.81mm)~ Pack of 50 jump rings~ Jump Rings are open~ Size options are the INNER DIAMETER of the ring as it refers to the mandrel size used to make the rings.