This multi-tier storage shelf is crafted from selected materials including sturdy steel and durable CARB P2-compliant MDF boards this shelf is both robust and versatile. Its adjustable height and modular design allow you to customize the structure to fit your needs.Installation is a breeze. Simply connect the beams with the included steel pieces—no bolts required—and place the MDF boards on top. These shelves are ideal for storing books flowerpots luggage or any items you need to organize.