McKesson Mask is medium size adjustable inflation valve. Eliminates the possibility of Corneal Abrasion due to contour of mask and Requiring less facial pressure. Unique Ergonomic Shape fits all facial configurations for improved sealing capabilities. Benefit to clinicians include; Requires less hand pressure, reduces strain on hands, and prevents hand discomfort. Soft, pliable air filled cushion with and without an inflation valve. Versatility of size Includes six standard sizes to properly fit all your patients needs. The clear choice for patient and clinician comfort.