Ceramic Decor Centre Ltd. It is difficult to determine the exact slate that was used, but an educated guess would be Kund Multi 4x4 or African Gold 4x4 tumbled. This can be purchased through Ceramic Decor. Hope this helps!
These are the exact cabinets we need for our kitchen to match our built-ins. I've always wanted a two drawer dishwasher and I never even considered slate for a backdrop in the kitchen. I absolutely love it!!!!