Deep frames for 9-5/8 inch deep super. Excellent for queen rearing Great for Integrated Pest Management (IPM) Coated with 100% beeswax 6.6 mm cell sizeColonies 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.