filter ventilation dust soft light MEGACESS face mask brand name MEGACESScolor blue,pink,red,green,whitespecifications 50pcs/box 40boxes/ctnMaterial SBPP+MBPP+SBPPcrafts ultrasonic heat 2PLY 3PLY 4PLY size 17.5*9.5CMapplication biomedical,laboratory,clean,room environment for high environment requirement placesoutstanding feature filter ventilation dust soft light beijing MEGACESS non-woven ...