These rings are molded of natural white plastic to contrast in color with the frames. The inside of the ring is smooth. There are no projections to cut off with the honey. Each section requires two of these rings. Eight rings are required for each frame. Open the two frame-halves like a book, insert a ring into each cavity, lay a piece of foundation on one half, place the other frame-half on top and the frame is ready to be placed in the super.