http://www.gardenbedsmfg.com/special-shapes/castle-raised-garden-beds/ The exquisite Castle Raised Garden Bed Green is constructed of ZAM steel, an up-to-date, environmentally friendly material that is durable and corrosion resistant. You may want to put a layer of gravel or gravel at the bottom of the garden bed. This will help with filtration and drainage. Our raised garden beds are easy to assemble and are perfect for growing vegetables, herbs and flowers. We do our best to contribute to gardening so that everyone can garden. It's an honor we should do. Product Parameter (Specification) of Castle Raised Garden Bed Green Castle Raised Garden Bed Green is 32 inches with 4pcs 17" corner panels, 8pcs 17" side panels and 4pcs 32" corner panels. And you may also adjust the size to the shape you want by adding or reducing panels. (Length 96"*Width 24"*Height 32") Product Details of Castle Raised Garden Bed Green