The dual core filter from HYGMASK exceeds the FFP3 standard according to the test certificate of the Austrian Research Institute “OFI” with 99.8% filtration. Read more details in the test certificate and test report CERTIFICATES. Our dual core anti-virus filter pads are a class I medical device. Made in Austria and carry a CE mark The exams were based on: EN 149:2001 + A1 viruses EN 149:2001 + A1 NACL EN 14683:2019 + AC: 2019 Shipping and delivery time The delivery time is about 3 - 7 days. Vendor information You can find information about the manufacturer in the imprint