Run-Around Wheels provide free-wheeling fun for your furry friend. The Run-Around Wheel is perfectly sized for dwarf hamsters, younger hamsters, and mice. These stylish wire wheels are available in a variety of four fun colors. Each wheel is covered in an extra-durable, powder-coated surface making them easy to wash as well as rust resistant. Run-Around Wheels feature Kaytee unique tail-safe and e-z exit design.