Run-Around Wheels provide free-wheeling fun for your furry friend! The 4.5" 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.