I recommend against this toy...it's possible that I got a defective one, but it seems weak and poorly designed.
Foraging Wheel X-Large by Creative Foraging - FORAGING TOYS by MY SAFE BIRD STORE
I couldn't get the wheel to spin without a lot of force, more than I would expect a parrot to use. They have to pull, then turn, but the pulling is ridiculous. You can adjust it some, but it was either too tight, or falling off. It was so difficult for me that I ended up dropping it not once, but three times. Each time, part of the post with threads that you need to attach it to the cage came off. I was going to glue them back on, but since it didn't work anyway, I didn't bother. Ours has never been used and will probably one day just end up in the trash.