Those are simple. They are four strands cut to 30" with a two wrap hangman's noose as the slide. Double the cord over a snap or solid ring and lash the strands together with another short section of cord. I did that setup in nickel but I have also done them with brass hardware. To me the antique brass finish looks much better. The first one below is deer hide, the rest are varying grades of cow leather. Some work better, others make better photo props.