Mating Nuc: Very efficient for mating a few queens in the backyard or remote apiary using only a cupful of bees at a time, leaving more bees in your other colonies to maintain honey production. Includes 4 mini frames (2 for each side of the nuc), built-in feeders with excluders on each side to keep queen out, entrance adapters for each side, one top cover for the entire duplex, clear plastic inner cover for each side, and removable bottom for each side.