Ship from USA! Anti Dust Face Cover Mouth Filter Air Breathing DIY Filter Accessories - Breathing Face Cover Valves Dust-proof Wind-proof Foggy Haze Cover Filter. Anti-saliva, anti-smog, dust proof, suitable activated carbon. Works great for face mask DIY. Simple installation, cut a hole in the mask, and press the breathing valve upwards. 1 Piece includes : Outer Cover ( Black/White ) X 1 Silicone Washer [ Yellow ] X 1 Inner Buckle [ Black / White ] X 1 SPECIFICATIONS Model Vigor Shape Square Material ABS Anti-saliva Yes Anti-smog Yes Dust-proof Yes Activated carbon Yes Odor resistant Yes Comfortable Yes Reusable Yes Washable Yes Designed for fashion and sharper look Yes Ship from USA Yes Weight 2-g Outer Cover Size 38-mm X 38-mm Inner Buckle Size 34-mm X 34-mm Silicone Washer Diameter 24-mm Thickness 8-mm to 12-mm IN THE PACKAGE: Black Pack of 6 = 6-piece Black + 0-piece White Pack of 12 = 12-piece Black + 0-piece White Pack of 20 = 20-piece Black + 0-piece White Pack of 50 = 50-piece Black + 0-piece White Pack of 100 =100-piece Black + 0-piece White White Pack of 6 = 0-piece Black + 6-piece White Pack of 12 = 0-piece Black + 12-piece White Pack of 20 = 0-piece Black + 20-piece White Pack of 50 = 0-piece Black + 50-piece White Pack of 100 = 0-piece Black + 100-piece White Half-and-half Pack of 6 = 3-piece Black + 3-piece White Pack of 12 = 6-piece Black + 6-piece White Pack of 20 = 10-piece Black + 10-piece White Pack of 50 = 25-piece Black + 25-piece White Pack of 100 = 50-piece Black + 50-piece White