Made of durable solid pine wood, our 5 pc. Pack of beehive entrance reducers measures 14-5/8" long x ¾" x ¾". Choose between 4-5/8 " or a smaller 1" opening. Beehive entrance reducers offer several important features and benefits for beekeepers, including adjustable entrance size, enhanced defense against predators, improved temperature and ventilation regulation. By utilizing entrance reducers effectively, beekeepers can promote the health and productivity of their honey bee colonies while mitigating various risks and challenges associated with beekeeping.