1. 100% Korean manufacturing and production mask. 2. Passed strict Korean Food and Drug Administration approval. 3. High filtration rate of over BEF 94%. 4. 3D Type of mask. 5. Fast delivery . 6. Same grade as FFP2 7. The mask has strap control, so anyone can wear it comfortably depending on the size of the face. 8. FDA CLASS 1 Registered.