Lgarden Elevated Gardening System Includes component materials - powder-coated steel, and wood, includes poly liner with drainage. Convenient Height at waist that helps with back and knee strain. Four large, scratch resistant wheels allows the safe maneuver of soil and plants up to 500 lbs. Travels on most decking or patio surfaces with ease. Constructed with UV resistant coated steel to ensure long lasting outdoor use. There is a 5 mm vinyl liner and bottom drain system in the bed support. The lower shelf provides storage for items that you want to keep close.