Take a Macaw Birdie Bagel, some plastic, some wood, and a bit of 1/4" cotton rope and you get the Ferris Wheel. We threw in a little bit of everything to give every parrot something fun to knaw on and keep him busy. The Macaw Bagel is the thickest of birdie bagels, at two inches and gave us lots of room to attach other items, inside and out. The inside sports a plastic golf ball surrounded by six wooden spools. The outside has a variety of plastic daisy and water washers, completed by either wooden wagon wheels or wooden circle beads. Everything is held together with natural, untreated cotton rope. It is then hung by cotton rope that also contains two wooden wagon wheels, a wooden circle bead, and a 3.5mm wide jaw stainless steel quick link. A real chewers dream.