The Honey Keeper Queen Excluder is a perforated barrier that prevents the queen from moving up into the honey supers and keeps her in the brood chamber where she can lay eggs and raise baby bees. Keeping broods out of honey supers means you won't have to carefully inspect each frame of honey for the location of the queen, making harvesting easier and faster. It works with the uniquely designed grid that allows the worker bees to pass through but stops the larger queen from getting in and laying her eggs in the honey to be harvested for human consumption. Separating the queen from the worker bees also helps regulate the beehive population, making the colony less defensive. The excluder is made of durable, lightweight plastic that is corrosion proof, yet gentle on bees' delicate wings. The plastic's flexibility also makes our excluders are easy to clean.The pack comes with two plastic excluders to fit 10-frame Langstroth beehives. Dimensions: 20" Wide x 16-1/2" High Care Instructions: Simply place the excluder in the freezer overnight. Once the wax has frozen, gently twist to pop the wax off. Honey Keeper provides reliable beekeeping supplies designed to support all colony habitats and promote long-term hive health.