Easy Usage: Simply insert one filter into cloth facemask for added protection. *Recommended to replace filter once per week.
Highly efficient Filtering yet very lightweight & breathable: 5 layer PM 2.5 design: 2 outer layers of anti stick, water resistant cloth. 2 layers of filter cloth. 1 layer of activated charcoal.
No fake materials.
Adult : 4.8" x 3". Children: 4" x 2.8"