Australian Made Nuplas Rebated 10 Frame Lids are moulded to Langstroth standard dimensions and feature migratory vents. The reinforced ribbing on the side of the lid gives added strength and durability for strapping with emlocks and are UV stable for 30+ years. The rebated lid sits proud of the top box, comes down the outer side wall locating over the top, eliminating any chance of rain entering the top box.