Nicolock R- KODAH YB 6" Kodah Wall York Brown is a large-scale retaining wall that retains its integrity for decades of use. Because of our state-of-the-art manufacturing process, these retaining wall blocks have the rough texture of rough, quarried limestone with a consistent, durable base mix. Each pallet includes stones in four different lengths to give your walls a uniform or overlapping look. You can build a multilevel garden wall, enclosed outdoor entertaining area or extra-tall retaining wall to protect living spaces from erosion.