This welded chain includes 2 O rings (loose on the chain) and one fixed O-ring, designed for use in combination with nylon webbing, leather, or other similar materials for the construction on martingale dog collars (aka greyhound collars) The total circumference of this loose martingale chain is 5.5". This is a very small delicate chain- about the circumference of a human palm. Rust resistant chrome plating adds shine and style to this martingale chain.Priced per piece. For bigger dogs see the 3/4" martingale chains and 1" martingale chains. For larger dogs check out the heavy weight verson of this chain.