ZLINE’s professional black stainless steel is truly unique in the industry. Each piece is hand cut and crafted utilizing premium grade stainless steel which accomplishes its sophisticated “piano black” finish through a technique called PVD (Physical Vapor Deposition) Coating. Also known as sputtering, this technique utilizes a vaporization process to create an atom-bonded, strong ceramic layer in order to achieve its stunning black stainless shine and built-to-last quality. The PVD ceramic layer is composed of abrasion-resistant material, ensuring that its pristine finish will be enjoyed for years to come. The industrial design of the (RAB) is executed through precise lines and detailing done with a precision laser. Each model includes Italian burners delivering over 44,000 BTU’s and also includes a durable, solid-piece Cast Iron Grates finalizing its industrial look.