Dual Cartridge Silicone Half Mask. (Shown with N75003 cartridges) Silicone facepiece material conforms to facial features and doesn‘t harden with age. Silicone is easy to clean, durable and resists distortion. Contoured sealing flange and cradle suspension system eliminates discomfort caused by pressure points on facial nerves. Nose area design is comfortable and well-fitting. Minimal dead air space limits re-breathing of exhaled air. Direct cartridge-to-facepiece seal minimizes replacement parts and simplifies maintenance. The most comfortable and durable half mask available.