A water-repellent mask filter made from melt blown spunbound 75 GSM. It is a type of HEPA (High Efficiency Particulate Air) Filter. This 100% virgin polypropylene filtration material has been tested to block 90% airborne particles with an average particle size of 3.0 +/- 0.3 microns.
1 pack consists of 30 sheets of mask filter.
Simply put the filter inside the slot at the back of our cloth mask!