?GlobalRoll Warm Tips?: Please pay attention to the connector method when purchg, our oxygen masks are divided into two types: ordinary connector and Screw Connector. Do not use if package is open or damaged. Oxygen mask is for single use, please discard after use. ?DEHP-Free and Latex-Free Material?: Oxygen mask made of pvc material, no irritating smell, soft and comfortable to wear. It is individually wrapped, used for patient's breathing oxygen, and can also be performed as atomization treatment. ?Rotatable Tubing Connector?: The tubing connector swivels to facilitate use on either side of patient .Face mask with adjustable metal strip and latex-free elastic band, secure the mask on the patient's face with the elastic strap then adjust metal strip ensures a comfortable fit. ?High Concentration Oxygen Mask?: Valves located on external mask surface open during exhalation and close when there is an inspiratory effort, The exhaled air exits through the diaphragms on both sides of the mask, will not enter the oxygen bag, ensure that the concentration of inhaled oxygen is higher. ?Non Rebreather Oxygen Mask?: Oxygen Mask is composed of a mask, 7feet kink-resistant oxygen tube and oxygen bag, made of medical-grade material and is used for oxygen delivery for patients with difficulty breathing and hypoxia.