100% brand new and high quality Masks structure: two from outside surface layer in a layer of superfine melt-blown non-woven filter paper, with aluminum strip, round rubber nose, folding The respirator use: permeability is good Don't boring Can achieve the effect of dust The bridge of the nose with aluminum strip can be fixed role. No particle ultrasonic sealing edge, wear comfortable Non-woven masks for one-time items, easy to use, and make relevant purification treatment, can be used for food. The medical, pharmaceutical, electronics, textiles. Clean room operators, also can be used to do everyday products. Many industries Advantages: ventilation, dust and filter bacteria Masks specification: 17.5x 9cm/6.81 x 3.74", three layers ItemDisposable face mask Namewashable dust mask MaterialNon-woven StyleWith elastic ear loops, 3 layers Size17.5 x 9.5 cm, weight:25g+20g+25g Colorblue/black/white, other color as your request Package50pcs/box,40boxes/ctn,