Our Masks have a filter pocket in mask that you can replace with filters when you want added protection.
Each pack consists 5x Filters
PM2.5, 5-layered activated carbon filter
Each filter measures 4.5"w x 3"h to fit in most reusable face masks.
DISCLAIMER These filters are NOT for professional use and NOT medically rated. These masks have no proven effectiveness against any viruses. Made in China.