I have two african grey parrots, one in a large cage and the other one prefers a smaller cozy one.
This fits excellent in the larger cage, and Homer loves it; to the point he prefers it over his swinging perch! He's had this in his cage for a few months now, and he still hasn't torn it apart! Normally things dont last months with him!!
On the other hand, in my lil lady's cage, it was a tighter fit and she kept getting it caught on her more favorite (stable) perch. She seems to have more fun banging it against the sides of the cage. And, she hasnt managed to tear it up, either!!
Overall, its very durable and they both fit in the holes just fine.

Pros: very durable

Cons: sometimes awkward in smaller cages

My bird loves these because he can swing on the perch! The width is great for his feet and the rubber makes it very durable. The only problem is that it might be a little hard for bigger birds to fit inside comfortably

Pros: allows bird to swing, durable, easy to clean

Cons: can be a little small

My bird loves to hang from it.

Pros: Keeps birds busy

Cons: none

These ar eexcelent choice of swinging fun for birds. THey are easy to clean and durable. They can also be used for smaller breeds.

Pros: nice looking durable

Cons: none

These rings were very entertaining to Ollie, my Amazon. He would swing from them, chew on them, talk to them. Over all a great toy for the bird. I would recommend to other bird owners. Affordable and durable.

Pros: durable, washable, colorful. entertaining

Cons: none to note