The Vevor king size box spring is a heavy-duty mattress foundation designed to provide stable support for your bed. Its thick steel frame supports up to 3500 lbs for dependable durability and long-term use. A removable, shrink-resistant fabric cover helps keep the mattress in place while giving the frame a cleaner finished look. The 9" high-profile design works well with lower mattresses or for users who prefer a taller bed setup. Easy assembly hardware and instructions are included for a quick installation process.