Chen Shui-bian tendons sewn two-story non-woven masks Introduction1,Gram of 20 G +20 G (non- woven fabrics)2, The first layer cloth colors are white, blue, green, yellow, red, etc.3,The specifications of masks can be changed 4, Products are produced by sewing machine 5,Grams of material can be changedMedical standards (BEF)More than 99% 25 +25 GGeneral standards (BEF)About 95% 20+20G