Run-around wheels provide free-wheeling fun for your furry friend. The 4-1/2-inch mini 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 super pet"s unique tail-safe and e-z exit design.