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