Prevent non-oil particles and the filtering efficiency exceeds 95%; Honeywell's professional Anti-counterfeiting filter material to guarantee good quality The built-in nose clip resists bending, is apt to shape and have a better fitness and safety without metal exposure; The nose clip is made of high-strength plastic composite metal, and its bending resistance capacity is enhanced significantly compared with the metal nose clip; The advanced sealing material is used for the nose pad, characterized by high fitness, softness and comfort; it can relieve the pressure on the nose bridge and make you feel more comfortable; The elastic headband can help to relieve the pressure from the head; and it is suitable for long hours of use; The big size offers much breathing space inside, more comfort. Overall dimensions are 5-1/4" (inches) width x 5" (inches) height with a nose clip to secure the mask to face.