Slim brushes easily clean nectar feeder portsKeep your hummingbird’s feeder perfectly clean and free of mold. Unsightly and unhealthy mold can form within a nectar feeder’s tiny ports where it’s really difficult to remove. Our set of three nectar feeder brushes are slim enough to reach into the tiny openings to thoroughly clean your feeder and keep your little hummingbirds healthy all summer long. Set of three brushes, each 3-1/2 inches long.