J-Block is one of the easiest do-it-yourself retaining wall systems available. It requires no mortar, footings, or interlocking pins. Each unit weighs only 30 pounds allowing for fast and easy installation. J-Block are light enough to be installed by just about anyone. The tapered sides allow for a 38 inch diameter to be made. With the built in set-back lip on each unit, proper alignment and set-back are automatic. With a little imagination and a few hand tools it is easy to build straight walls, inside curves, outside curves, and anything from a few inches to over three feet in height. That means you can create retaining walls, tree rings, planters, terrace gardens, steps and much more.