An excellent toy for a budgie.
I bought Beekle a plastic landing platform and happened to get one with a bell on one side and a mirror on the other. Both are mounted inside plastic rings but only hanging from the top.
Once he got over the initial "what the heck is that?" phase he went mad. He seems to think that he can climb through the plastic ring to get to the budgie on the other side. Watching him contort his way through the ring and finding himself hanging over empty space then wriggle his way back round is hilarious.
He hasn't worked out how to land on it yet, though. He prefers to land on his cage roof then jump off, turn round and land on the platform. Whenever he does that he squeaks excitedly.
Highly recommended if you see one somewhere.