Apeks Tungsten XTX RegulatorThe XTX Tungsten is built upon the XTX200 platform but with a truly unique, added eature: it is protected with a hard, durable PVD (Physical Vapor Deposition) finish. This tough as nails finish is better than traditional chrome plating. The coating is made of high quality grades of Titanium, Zirconium and Chromium. The result is not only rich, but protects your investment from normal diving abuse. Features the innovative Diver Changeable Exhaust (DCE)