over a dozen birds in larger flight cage. These perches stretch across the width of the cage (approx. 30" width -- 2 sets) with a couple extra for another cage. The canaries immediately used them and most choose to roost overnight in them. I'm planning on getting more.
The only reason a 5 star rating was not given is that the round twist connectors do not easily accommodate a little thicker diameter cage bar. I had to use pliers on one cage to get them to attach and I worried I'd strip them. I skipped multiple perches and only used 3 or 4 connectors for the entire string of perches spanning the width of the cage.