The HummZinger Ultra, by Aspects, combines patented Nectar-guard tips with a built-in ant moat. Nectar-Guard tips are flexible membranes attached to the HummZinger Ultra’s feed ports. These unique tips prohibit entry from flying insects while allowing unrestricted feeding by hummingbirds. Also, the built-in ant moat stops crawling insects in their tracks before they can reach the nectar. These two patented features combine to give our HummZinger Ultra the ultimate in protection from both flying and crawling insects while you can enjoy the hummingbirds. Lifetime Guarantee. Features a 12 oz capacity, 4 feeding ports, hang or post mount, bee & ant resistant, easy to clean, brass rod for hanging, built-in ant moat, and raised ports divert rain.