A hamster running loose in a room unsupervised finds every cable, gap and skirting board within about thirty seconds, which is the entire case for a proper runaround ball over letting it explore freely.

This is a clear plastic runaround exercise ball, easy to assemble and simple to clean, sized for hamsters and gerbils. Small 'N' Furry's range runs in three sizes in total; the two carried here are drawn from that same range, and the maker gives a diameter of 17cm for the Medium size specifically.

• Clear plastic runaround exercise ball
• Easy to assemble, simple to clean
• Suitable for hamsters and gerbils
• Range runs in 3 sizes; two sizes stocked here

On the two sizes. The 17cm diameter given by the maker applies to the Medium size specifically; no diameter is supplied for the smaller size on this card, so match the size to the animal's own build rather than assuming both are close in dimension. The manufacturer's own range runs to three sizes in total; this listing covers two of them.

Who it's for: owners of hamsters and gerbils wanting a clear, easy-to-clean runaround ball for supervised exercise outside the cage.