Cell protectors are used to protect queen cells installed by a beekeeper when making nucs or splits. Bees sometimes will damage queen cells, in particular if the nuc or split has just been made and the colony is not ready for a new queen cell just yet. The cell protector protects the sides of the cell, leaving the tip exposed so that the queen can still emerge (the bees don't usually exploit this open area). JZ's BZ's durable Cell Protector hangs between two top bars, and is easy to install in a colony without removing any frames.
Notes: