Made using the Top-Rated Steel on the market for garden applications. The thick gauge steel is hot-dipped and coated with a specialized alloy layer to maximize durability.    The modular design gives you endless configurations when buying multiple sets. These boxes are designed to last 3 -7x longer than galvanized steel and have a lifespan up to 20 years. A rolled steel edge and a commercial grade rubber strip line the top of the box providing a comfortable place to rest arms and hands on, while also making it safe for kids. Rounded corners and acorn nuts provide additional safety considerations. 17” growing depth provide sample room for strong roots and less bending over. 100% recyclable metal, green manufacturing process.