Inner Cover / Feeder Board / Crown Board
These Inner cover can be used for multiple purposes. They are designed to go between the top super and the lid. Firstly they can be used as a simple inner cover to block bees from going into the lid and building comb.
They are also called feeder boards as you can add a top feeder or simply add sugar on top of the board. The boards are solid so to be used as a feeder board a simple hole will need to be drilled.