Hand-thrown on a potter’s wheel by American artisans, each ceramic piece is fired to 2400°F to create a durable home for birds. The vitreous nature of the material and the design of each preclude any weather-related problems of rot, UV degradation or breakage from freezing. For small birds like chickadees, select the small hanging feeder, the nesting box, the cottage house or all three. The butternut finish will vary due to firing. Opening varies since each is hand thrown: 11/8"DIA. to 1¼"DIA.