Air Queen Breeze mask (FFP2) Washable up to 10 times using ethanol (ethyl alcohol) AirQUEEN Nano mask is 4.38g. (Lighter than a sheet of paper) 3D ergonomic design to FIT PERFECTLY on all face types. level evaluation for KF94 , Tested at FITI by MFDS more than 94% filtration efficiency Light weight for all-day wear Approved by FDA, European SGS, REACH, RoHS, KAKEN and CDC, and therefore is safe.