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3200 masks 10pcs 3701cn filter cotton half face dust-proof mask anti industrial construction dust haze fog safety gas mask characteristic: color: gray material: rubber used with 3200 filter holder and filter cotton, it is very suitable for dustproof. single tank mask, light weight, compact shape it is highly matched with face shape and has good sealing effect. high elastic headband, long service time. good elasticity, strong and durable. the design of hanging headband does not confli...