Encourage hummingbirds to visit more often! Flying insects, like bees and wasps, can't reach the nectar with these nectar guard tips in place. Features clear plastic membrane with crosshatched opening—the hummingbird's slender bill fits perfectly through the flexible plastic barrier! Fits only these hummingbird feeders: HummZinger High Views, HummZinger Ultra, the HummZinger Fancy and Little Fancy. Also fits the HummBlossoms. 1/4 inch diameter.