This unique retaining wall design that has five different sizes and two heights is called Madera. It is hard split then aged to give it the natural stone effect. It can be designed for freestanding or gravity walls – two functions in one. The most unique aspect of this wall is that there are no mechanical connections such as lips or pins – meaning no extra costs or hassles. This wall will give you more choices than any other wall on the market. The units are available in two heights, 3” and 6” and range in length from 8” to 28”. Because of the walls unique configuration, it makes it easy to create a wall with multiple sizes.