First stage body material: chrome-plated polished brass. First stage characteristics: balanced diaphragm design. Second stage material: technopolymers, elastomers, and cover manufactured with corrosion- and scratch-resistant Luxury Technology treatment. Second stage characteristics: the new lever ensures reduced friction, making inhaling very fluid and linear. HP ports: 2. LP ports: 4. Other features: option to adjust intermediate pressure from the outside. There are no holes on the front cover, which prevents free flow even when facing strong currents.