Adjustable with a a cotton round braided cord from 13" to 23" inches.
Only 1! **one of a kind**
I got the wire to practice second hand, I cannot guarantee it is nickel free. It seems to be tarnish resistant and was pretty soft work with. Seems be some kind of either anodized or plated copper. Silver look.
This is an Interlock Bail pattern I learned from CoparAingeal.