Nectar Guard tips easily slide onto the feeding ports on the underside of the feeder cover. The flexible membrane in the center of each tip easily opens when hummingbirds insert their beaks to feed and close up tight when beaks are removed. These create a barrier flying insects cant penetrate.

Compatiblewith the following Aspects brand feeders: HummZinger High Views, HummZinger Ultra, the HummZinger Fancy, Little Fancy and HummBlossoms. 1/4 inch diameter.