Polystyrene National complete polyhive incl.: 1 floor incl. varroa tray and metal grid1 roof2 supers incl. framerest1 brood incl. framerest 1 innercover (transparent plastic) 1 queen excluder (plastic)Polyhives is a newly devolped polystyrene hive made from high density polystyrene. Manufactured in Denmark specially for the British market. Polyhives are highly insulating, do not rot, have an improved interior climate which ensures a large honey harvest. With dove tails. Easy to assemble!Great advantages as compared with traditional wooden beehives.Compatible with National wood hives.