The Natart Linea Double Bed Conversion Rails convert the Linea Island Convertible Crib into a full-size 54-inch double bed when paired with the Linea low profile footboard. Crafted from natural oak wood with the collection's refined Scandinavian finish, the rails are made in Canada and GREENGUARD Gold certified with non-toxic, very low VOC finishes, for use with a standard 54-inch mattress and box spring or bunky board.