"The wire is space very far apart making it easy for your critter to get hay or veggies. There is about 4 bars per side (half of the ball), and they are about 1-2inches apart.
The chain is short however, so if you have a tall cage your animal won't be able to reach it, so then hang the ball on the side of the cage, from a lower wire (if you have a wire cage).
I have the Super Pet brand cages for my animals and this treat ball works well in them!
The colours that I have seen are berry red, sea foam green and navy blue. There may be other colours, but I haven't seen them.
I suggest to give this product a try for all small animals. Its made of metal so it outlasts plastic hay holders and is easy to use. Plus for the price you can't go wrong!
Note: I got the large size at my local petco, and it really is large, so its meant for guinea pigs and rabbits."