7450 Series Silicone V2™ Oro-Nasal Mask is the latest face piece design from Hans Rudolph. Molded of BLUE silicone rubber, the anatomically shaped design aids in a leak free comfortable fit. New FIVE Strap adjustable headgear design. Custom mask adapters are designed and manufactured to mate most any component or flow meter. Two-Way Non-Rebreathing valves are available for this face mask. Five sizes available.