BLUESTONE EXT - Charcoal & Grey The beautiful look of stone found in an external environment truly makes way for being at one with the tranquility of outdoors. Embrace the organic, earthy, elegant, fun, sophisticated and understated feel. True opulence. The very workable sizes in400x600x20mm and the 600x600x20mm - (the 600 x600 includes a matching coping in 300x1200x20, make your outdoor, alfresco, pool area the place to be. Your Oasis !!