Made of 4 layers of Thick Material, including middle melt bown ply. Used to keep away from Dust, bacteria, and virus. It is comfortable designed of Civil Grade. This one size fits all . FDA&CE certificates, Comply to EN 149:2001+A1:2009ffp2, also comply to China GB2626-2006. It is with embedded plastic nose clip. Complies with FDA. 6.62''LX4.14
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