Mountain Bluestone 6 in. x 18 in. L-Panel Wall Tile is a Natural sandstone with a blend of blue and soothing gray tones is designed for use around corners. This complements a wall install of similar ledger panels and helps finish the corners. This tile is suitable for indoor or outdoor walls in residential and commercial installations. Note: Natural stone products inherently lack uniformity and are subject to variation in color, shade, finish etc. It is recommended to blend tiles from different boxes when installing. Natural stones may be characterized by dry seams and pits that are often filled. The filling can work its way out and it may be necessary to refill these voids as part of a normal maintenance procedure. All natural stone products should be sealed with a penetrating sealer.