Three-layer mask, color can be customized: white, blue, black, size 17.5 * 9.5 CM, filtration efficiency> 95%, Outer layer spunbond PP non-woven fabric: 20-25 g/m2 Filtering medium-sized melt-blown PP non-woven fabric: 20-30gsm Unlined ES non-woven fabric: 25 g/m Factory price 0.08 to 0.3 USD
