The hummingbirds just love our brightly colored hand blown glass feeders. Watch them from your window as they buzz around and drink from our one of a kind works of art. These feeders are blown extra thick, with a very stout hook on the top, designed to withstand the elements. The glass will hold approximately 24oz of fluid but they are hand blown and the size does vary from one feeder to the next. Its always best to measure the capacity, filling up with water first, then make a little extra nectar and store in the refrigerator for quick refilling.