Wire deck lends firm even support Convenient, storable sleeping surfaces Sturdy construction, designed for long life and safety Collapsible trundle for storage easily lifts up Common for children, sleep- overs and guests Minimal assembly required, no tools needed, just hook in the top into the leg frame All steel construction, finish black The Ultimate in Function! "One of the most functional pieces of furniture you can buy". Trundle Beds are a smart choice for many reasons. The metal trundle bed set can be used in the following four ways: Space Saving Single Twin Bed - Leave the trundle rolled under the high rise frame and you literally add square feet to your home. Roll the trundle out but leave it in the down position, this is the most common use for kids and sleep-over and that type of situation. Trundle Bed Mattress Requirements: require a mattress that is 9" thick or less and standard twin size. Mattresses are not included it could be purchased separately.