face masks reusable 20 pack 5ply cup dust face mask for women men with nose wire bio-th bio-th highly efficient protection comfort safety dust poof with process of melting and compressing. 5 ply protection with polypropylene non-woven fiber and melt blown. manufactured by low sensitization material. caution cover the mouth and nose with dust mask and tight the ear loop. try to reduce the gap between face and mask as less as possible. during the process of using we must avoid touching the mask. we must clean hands with water, soap and sanitizer after we touch mask. comfortable to use.