I believe the metal is aluminum; I added a colored copper ring and lobster clasp to the ends. The rings are round and have a twisted look.
The chain is 18 inches long including the clasp and ring, or ~45cm
Clean with water and plain blue dish soap; do not use chemical cleaners or wear in the shower or swimming. Body chemistries may have an effect on certain metals.
Not for children age 15 and under.
Please see my shop policies for info about safe wear and care of chainmaille jewelry.