Kaytee Flex-e Fun-nel is the ultimate clear ferret exerciser. Flex-e Fun-nel stretches into 8 feet of tunneling fun for your favorite furry friend. Use a Ferret Trail connector ring (sold separately) to connect two Flex-e Fun-noels to each other. Flex-e Fun-nels attach directly to ferret rail tubes and elbows creating a playground system for ferrets and other pets. Giving your pet access into and out of their home.