What is the ideal roosting bar for chickens?

Excuse me, could you please elaborate on what you mean by "ideal roosting bar for chickens"? Are you referring to the specific design, material, or placement of the roosting bar that would be most suitable for chickens to rest on at night? Are there any factors that you consider essential in determining the ideal roosting bar, such as durability, comfort, or ease of cleaning? I'm interested in hearing your thoughts on this topic.