Anesthesia Mask, also named cushion, mask have a cuff that allows for a complete seal to be achieved between the mask and the patient's face. The Anesthesia Mask can therefore be used to deliver non-invasive ventilation (NIV). The cuff volume can typically be adjusted through a non-return valve. The mask is supplied with a detachable hook ring, which allows for the mask to be held in place with a head strap for delivering NIV. Seven sizes are available: 1/2/3/4/5/6/7#.