Nicolock GARDEN CHAR 16" x 6" Garden Wall Charcoal you can create a sturdy landscape wall that looks just as incredible as it is durable. This graceful wall system features classic lines and a natural, hard-split rock face texture to accentuate the outdoor beauty. Each solid stone measures 6 by 16 inches with tapered sides for easy curves. The double tongue-and-groove interlocking system keeps the retaining wall blocks firmly together. Multi Cap Wall Stones and 6-inch corner blocks are available to complete your custom wall system.