Quantity: 1 piece; Size: M; Height: 4.9 inches (124 mm); Width: 3.9 inches (99 mm); Particle gathering efficiency (%): over 96 ; Intake resistance (Pa): less than 80 ; Weight: 5.6 oz (165 g); Exhaust resistance (Pa): less than 60 Pa; National certification Classification RL2 certified model No. TM503) Name: DR76. DSU2K; Contains activated carbon fiber (ACF) to remove unpleasant odors produced during welding. Welding work; Asthma work (Breath protective gear section 4)