Be sure to purchase what is most suitable for your bird and the size of the hole that is drilled. Be sure it is bird safe leather and not treated with any chemicals or dyes. There are several different types of rope. Two popular types are solid braided rope and twisted rope. Some are harder to find than others.
Some birds enjoy unraveling the rope, then they can preen it.
Be sure all the frayed ends are trimmed so that your bird does not get caught. As the rope frays it becomes a trap for your bird. Any alternatives are not considered bird safe. Cotton Material . Colored material can be purchased and using a Pinking Shear will discourage fraying but always be sure to trim the frayed ends back daily.