Product Description 1>Non-woven Face Mask used in hospital 2>ISO,CE,FDA,TUV,Nelson proved 3>17.5x9.5cm,20+22+25g 4>Rapid feedback,good after-saleDescription: Our Non-woven Face Mask have been gotten the NELSON certification and BFE has reached 99.1%. This rate is much higher than normal standard of 98%.