mask with valve 1, soft fabric, cut uniform, wear comfortable 2,pleasing in appearance N95 round valve mask Packing: 20pcs/box ... without the resistance 6, suitable for European facial 7, with the latest PPE (III) EN149 + A1: 2009; ... materials. High efficiency, low resistance.Three-materialmanufacturing,high-filtration strong electrostatic filter layer,effective filtrationof solid particles, dust, ...