1.Our facemask has passed the test of Nelson Lab, and BFE IS 99.4%, VFE is 99.7%, 2. size:12cm*7cm, 14.5cm*9cm, 17.5*9.3cm feature1.Our facemask has passed the test of Nelson Lab, and BFE IS 99.4%, VFE is 99.7%, 2. size:12cm*7cm, 14.5cm*9cm, 17.5*9.3cm surgical facemask