Ultimate accessory for inside or outside of pet's cage. Great for multiple pets. Made of soft fleece and is equipped with 11 holes placed around the head and tunnels. Washing Instructions: Machine wash on gentle cycle with like colors. Wash in cold water and use regular strength detergent. Tumble dry low heat. Hanging Instructions: Fasten each of the four metal swivel clips to the bars of your ferret's cage. Hang in a location that is easily accessible to your pet, but that still won't inadvertently swing against any objects or cage sides and cause injury. Ferrets that are good at, and relish, climbing might prefer the Nap Sack be hung away from other objects to offer maximum safety. Non-climbers would benefit from the hammock being hung close to a cage shelf or tunnel opening for easy access.