Delivers oxygen concentrations between 60% to 80%. Partial Rebreather Mask does not have a valve covering the oxygen enrichment bag thus allowing the patient to re-breathe some exhaled gases. Soft, clear anatomical form provides long term comfort, even for hard-to-fit faces. Adjustable elastic band fits comfortably below the ears to hold the mask snugly in place. Comes with 7' three-channel safety tube.