This perch uses PVC 3/4" tubing for the "legs" and 3/4" hot tub tubing for the bow. I wanted to keep the perch white and the hot tub tubing is quite flexible and can be flexed to whatever curve you would like. The ring is 2" inside diameter stainless steel or I may replace with a 2" split ring version to reduce resistance on the bird's feet. A pair of these perches will be fastened to a large table setup (shelf) for the falcons.