OKT1311 Features: * Cartridges come with a new inhalation valve for less maintenance and fewer parts to inventory * Conforms to the contours of your face without pressure points * Extra wide flange seals easily and stays sealed even when talking * Low profile provides a wider field of vision than any other respirator * Soft yet durable facepiece designed for comfort * Price is for 1 Each * Testing and approvals: * NIOSH approval