The queen excluder is a beekeepers best friend in keeping the queen out of laying in the honey supers. The queen will be focused on laying in the brood box area. Queen excluder is stainless steel with a wood frame. The wood frame allows the hive to not have any gaps that would allow other insects into the hive. Queen excluders should be placed before you add any honey supers and taken off when you harvest your honey supers. Failure to do this will put your queen and drones at risk.