Natural Concrete Products offers a system of stackable structurally sound blocks for retaining walls, garden walls, freestanding walls, fireplaces, firepits, columns and other landscaping and outdoor living projects. A locking lip on the back of each block gives structural integrity to the wall without mortar, ensures proper setback, and allows the wall to be curved to the inside or outside. Two-sided corner blocks support 90 degree turns and permit stairs to be built into a wall. Top caps provide a finished look. The blocks for each type of wall come in two styles. Random Stone consists of eight randomly faced blocks available in brown, gray and limestone colors that complement most cultured stone projects. Fossill Stone consists of 14 naturally textured brown or limestone colored blocks.