Made from real bamboo, actually the root of the bamboo is shaped and then kiln dried to retain its shape. Since it is made from the root and much like a tigers stripes, virtually no two rings are alike with its nodes structures. In addition, the color of the bamboo is determined by the amount of starched inherent in the bamboo and how long it was in the oven. These characteristic lends to each items uniqueness. The simple hardware takes minutes to mount up. The inside diameter of the larger measures about 6.5" diameter.