Specially-formulated Hummingbird Nectar. Premium patented concentrate formula. No messy sugars to boil or mix and no sticky cleanup. Mix one part nectar to three parts water. 4 oz. "single use" bottle is sold in a display and is a great impulse item. Each bottle fills one 16 oz. feeder. Contains sucrose, preferred by hummingbirds over monosaccharide glucose or fructose sugars.