Run-Around Wheels provide free-wheeling fun for your furry friend! The 4.5in 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 intail-safein and exit design.