Cedar Wood Construction for Durability ----- Natural Cedar wood outside frames with Pinewood honeycomb foundation frames, our beehive can resist against wear, decay & rot and stand up to years of use even under the toughest environment. Larger Volume ----- This 16-1/4? x 22? x 19-8/9? 20-Frame equipment is larger than 8 frame wood equipment by approximately 30 percent. When full of honey, a full 20-Frame bee hive can generate 20% more honey than that of 8-frame bee hive. Metal Roof ----- Pre-assembled metal roof helps to keep out the elements and maintain the purity as well as freshness of honey. Complete Design ----- Designed with a solid bottom board, entrance reducer and inner cover for your convenience. Include Everything You Need ----- The kit comes with everything you need to build a tight & sturdy bee hive; assembly can be completed in up to 10 minutes.