You can also move the posts around replacing one that is getting really scratched with one that has not been very scratched up. Modular Cat Furniture can be purchased at many pet stores, or follow the links below to purchase the furniture at an online pet store. Your ferret will sleep in the tunnel use it as a jungle gym and as a place to sneak attack from. There are many different variations of the tunnels. My recommendations are to find tunnels with metal clips to the cage, and a very solid fastening to the tunnel it self.
Tunnels come in many different varieties from fleece lined to straight tough fabric.
They also have many different types of chains to connect and hang from the cage. As well as many different external colors and designs. Buy a couple of tunnels and place them end to end to make one long tunnel or criss-cross them. This can add a lot more fun especially if you have more than one ferret. Ferret Tunnels can be purchased at most pet stores, or follow the links below to purchase a Ferret Tunnel online.