This is one of the finest Show Chains on the market...Solid brass plated with 22k gold plating and a protective clear coating ....and will not rust....This LIGHT-WEIGHT CURB-link chain is 1.6 mm thick... (approx. 1/8"). The seamless end-rings are 5/8" in diameter. Collar size, 14", ..... This beautiful chain has the look and feel of fine jewelry...14" size does not include the end ring measurements.