Five-layer Filtration: Multiple protection to isolate dust, multi-layer folding, good ventilation, double your protection with an additional filter. Reasonable Size: Filters size: 12x 8 cm/ 4.7 x 3.1 inches.It's compatible with majority of mouth cover available in the market. Wide applications: Activated Carbon Filter anti airborne particles dust,smoke,pollution,ash,gardening pollen and so on,suitable for most occasions.Filter insert can not be cleaned and should be replaced every day. Filtration technology: made of activated carbon and non-woven melt-blown filter cloth, five-layer filter system effectively keep away from PM 2.5 and a range of airborne contaminants.

Filtration technology: made of activated carbon and non-woven melt-blown filter cloth, five-layer filter system effectively keep away from PM 2.5 and a range of airborne contaminants. Wide applications: Activated Carbon Filter anti airborne particles dust,smoke,pollution,ash,gardening pollen and so on,suitable for most occasions.Filter insert can not be cleaned and should be replaced every day. Reasonable Size: Filters size: 12x 8 cm/ 4.7 x 3.1 inches.It's compatible with majority of mouth cover available in the market. Five-layer Filtration: Multiple protection to isolate dust, multi-layer folding, good ventilation, double your protection with an additional filter. Ship from USA- Package: 100 Pcs/bag.