Zinus 9 Inch High Profile BiFold Box Spring / Folding Mattress Foundation / Strong Steel structure / No assembly required, Split Queen Folding mattress foundation compresses for easy mobility and storage Designed to have the look of a traditional box spring No assembly required, simply open the box, slide the foundation out and unfold, it will immediately open to the shape of a box spring Steel frame with fabric cover Worry free 5 year limited warranty / Box Spring only, Bed frame sold separately