Place one of these cypress racks on top of your hive's bottom board. The rack does an excellent job in helping air circulation throughout the hive. Result? No cold drafts in the front of the hive, which in turn encourages the queen to lay eggs right to the very front of the combs. More eggs mean more bees, stronger hives, and more honey for you! We use these slatted racks on all of our hives. Assembly required.