Fabric IMPORTANT: Prior to placing your order, please measure the width of your bed to ensure these slats are a perfect fit. CENTRE SUPPORT: For larger mattress sizes, such as Full, Queen, King, and Cal. King, slats may require a centre support to prevent sagging and ensure proper support for the mattress EASY TO INSTALL: Simply lay down on your bed frame, attach them to the rails, and you're good to go. IMPROVED AIR CIRCULATION: Compared to traditional box springs, which can trap heat and moisture, wooden bed slats allow for better air circulation around the mattress. This helps to keep the mattress cool and dry, which can increase its lifespan. ITEM INCLUDES: Item includes Slats Only (Frame and mattress sold separately).