Medium frames for 6 5/8 inch depth super. • Excellent for queen rearing • Great for Integrated Pest Management (IPM) * Coated with 100% beeswax * 6.6 mm cell size Colonies need drone comb for a healthy hive. It's an instinct and they will build it. Plastic Drone Frames can be rotated out as a means to manage varroa mite levels. The green color makes it easily idenifiable.