The KN95 masks are made of high quality material. KN95 is an industry standard and means that the mask provides the intended effectiveness of filtering 95% of particles, including microorganisms, pollen, dust and air pollution
FFP2 face masks are the equivalent of N95 face masks. FFP2 masks have a minimum of 94% filtration percentage and a maximum of 8% leakage to the inside. These masks are not shaped to your face but are simply held in place by the elastic earloop and have a typical lifespan of 3-8 hours depending on environmental factors.
Useful information here on masks - https://www.dental-nursing.co.uk/news/covid-19-a-guide-to-face-masks
These masks are certified to EU standard, certificate below.