GIR's patent pending Filter 2.0 comes in refill packages of 10 filters each. Whether you're wearing a cloth face cover or your best silicone face mask, you should always use your mask with a filter, and dispose of the filter after use. 
GIR’s filters pass the following test standards, with specific results listed below:

• YY/T 0969-2013: BFE 99.7% filter efficiency
• GB/T 32610-2016: PFE 92.6% filter efficiency for 1 layer (we are using 2 electrostatic layers)
• GB2626: >95% at 0.3 microns

This is a general-purpose filter, and provides general-purpose protection. GIR is not a medical device manufacturer. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease. For discounted bulk filters in quantities of 20 packs or more, click here.