Lifetime Raised Garden Bed- The 4 ft. x 4 ft. Lifetime Raised Garden Bed features 9 in. high stackable walls and easy inter-locking assembly. This model is 4 pieces, making (1) 4 ft. x 4 ft. box and comes in brown. 5-year limited warranty.The 4 ft. x 4 ft. Raised Garden Bed from Lifetime Products gives you the perfect garden setup in less than one hour. It is constructed of UV-protected high-density polyethyene (HDPE) with a simulated wood design. It is low-maintenance, weather resistant, and will not rot, crack or peel. The walls are 9 inches high, and two beds can be stacked together to create 18-inch walls to accommodate deep rooted plants, or even a child's sandbox. With its easy do-it-yourself assembly and low-maintenance features, gardening has never been this easy.