Made of up to 22-gauge 0.8mm thickness corrugated galvanized steel with premium AkzoNobel powder coatings and 2 layers of anti-corrosion paint to make sure its strong anti-rust performance, withstanding rust, rot, mildew, UV rays and corrosion. The round heavy-duty stock tank kit is strong enough to hold soil for decades and last 7x longer time than plastic or wooden planter box. 18 in. Tall metal raised garden bed holds up to 179 Gal. of soil-great for shallow to medium rooting plants and vegetables like strawberry, corn, potato, beans, carrot and more. Create a row or a cluster, all the same height or get creative with all sorts of groupings. Just have fun in your garden. Color: Quartz Grey.