This mask comes with a charcoal filter insert.
Material: High-efficiency electrostatic filtration cotton & replaceable 5 layers filter.
Filter: with 5 layers filter
Features: reusable and washable
Type: KN95 standard filter

The "N95" label stands for the mask ability to filter out at least 95% of airborne particles larger than 0.3 microns (for reference, PM2.5 particles are 2.5 microns).

Corona Virus Mask -
What is the difference between face masks, N95, KN95, KF94, FFP2 respiratory face masks & face mask shields?

In summary, they are basically all the same. They stop 95% of particles >0.3 microns in size. The N95 is the USA Code, KN95 is China code, KF94 is Korea code and FFP2 is the EU code, this includes the UK.

KN95, KF95 and FFP2 face masks are N95 face mask alternatives & N95 equivalents. They are all the same.