PM2.5 replacement filters for face masks. This Activated Carbon Filter helps protect you against Particulate Matter 2.5. Size: (2 x 8 cm / 4.72 x 3.15 in) Suitable for all standard mouth mask with a filter slots Material: Non-woven fabricColor: White/GreyQuantity: 2 pieces in one package Recommended replacement of 1 or more times a day depending on your use. Please note: These are disposable supplies and cannot be washed. Not intended for Emergency Medical personnel. These are unavoidably individually packaged in plastic for hygiene reasons.