The StarBird Fine Vine Swingª simulates a natural tree vine with an added twist! The woven ball rattles and is just asking to be pounded by a happy beak. There 's a preener at the bottom as an added treat that can be chewed or preened. The Fine Vine will stimulate your birds to climb, swing and joyously flap their wings in gay abandon as they would in a forest, increasing their agility all the while as they scamper up and down the rope to play and have the time of their life. The Fine Vine is made of untreated Abaca. The Fine Vine is 36" long for the large and is 18" long for the small.