Pine Wood+mdf [No Box Spring Required] The wood slats support the mattresses not to slide and increase the service life. [Ample Storage] There are 6 storage cabinets on the side of the bed, that you can store books and toys, making room tidying a breeze. [Sturdy Construction] Made of high-quality solid pine wood and MDF with reliable construction, this bunk bed frame can last for long time use and ensure strong stability and durability. [Safety Guaranteed] Solid wood slats blend naturally into the already sturdy frame to give added ground-up support that provides stability. The bunk bed features guard rails for added safety. [Charging Station] This bed comes with 2 Standard Plug Outlets & 2 USB Ports on the top of the storage cabinets. It is very convenient for you to use your laptop to work immediately or to charge electronic devices while lying down.