The M1 employs state-of-the-art metals specifically chosen for extreme diving situations. Monel parts are used internally in the first stage for high strength, corrosion-resistance and oxygen compatibility. 316-stainless steel, multi-layer zirconium coated brass and titanium is used throughout the second stage. The M1 valve body is zirconium/nickel over brass and the seat saving orifice is stainless steel. Engineered by Atomic for specialty diving the M1 has an expanded performance range to meet almost any diving condition imaginable, whether recreational or technical. Accomplished specialty divers will appreciate this regulator designed to fulfill virtually any need or diving scenario. The M1 is built on the same platform as the world acclaimed T2 and B2 regulators.