1. Add breathing valve to isolate the smog and make the exhalation smooth.
2. Simple operation and easy to use.
3. Compatible with majority of Dust Masks available for adult in the market.
Material: PE + silica gel
External diameter: 40 * 35mm/1.57*1.38\\\"
Compatible: most dust masks on the market
Season: spring, summer, autumn, winter
Function: dust / wind / smoke / PM2.5
Gender: for adult
Quantity: 2pcs/ 5pcs / 10pcs / 15pcs / 20pcs
1. There may be slight size deviations due to manual measurement, different measuring methods and tools.
2. The picture may not reflect the actual color of the item because of different photographing light, angle and display monitor.
2/5/10/15/20 X Dust Mask Breathing Valves