general3 10/20 PCS Outdoor Anti-dust Face Mouth Filter Air Breathing Valve Filter One-Way Exhaust Valve Replacements Activated carbon PM2.5 filters Black -10 pcs-

 ??? Feature:???  ???    Made of ABS material, durable to use.  ???   Mask accessories, which should be used with mouth masks (not included).  ???     Suitable for sports masks, running masks, active carbon masks, etc..  ???     Item Name: Breathing valve               Material: ABS ???     Features: Replacement, Anti Haze, Mask Accessories   Outer Diameter: 37mm /1.46" (Approx.) Inner Diameter: 25mm/0.98" (Approx.)    Due to the light and screen setting difference, the item's color may be slightly different from the pictures.   Please allow slight dimension difference due to different manual measurement. ??? Package Content:???  10/20   PCS Outdoor Anti-dust Face Mouth Filter Air Breathing Valves Replacements