Run-around wheels provide free-wheeling fun for your furry friend. The 4-1/2" 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 pets unique tail-safe and e-z exit design.Made with durable wire.Encourage healthy exercise.