As most hamster cages are reasonably small, you will need an exercise wheel, so that they can run around as much as they want.
There are two different excircise balls you can get for your pet.
- The plastic ones
- The metal ones
Below: Lolly in metal exercise wheel Below: Plastic hamster wheel (guest hamster)
Hamsters are very Curious cretures, and will want to roam about the house every now and again. (if you have cats or dogs, this is not reccommended, as they will scare your hamster). As they are very small they can get into tiny akward gaps, and it can be hard to get them out again.
To prevent you from losing your pet, use a hamster exercise ball. Pic's below :)