m|devices Oxygen Masks are available with or without star lumen oxygen tubing and are offered in a range of four different sizes suiting paediatric to adult faces. All provide medium concentration and vary between elongated and standard mask shapes. Oxygen tubing: 2.1m and 3m lengths. The delivery of oxygen through m|devices Oxygen Mask enables the patient to be comfortable through the use of an adjustable strap and nose clip to ensure an adequate fit.