authentic protective childrens beikangshi three-layer white mask disposable thickened dustproof breathable spot

origin mainland china type dust mask material non-woven meltblown fabric weight 0.050 packing method box mask style ear-mounted breathing valve device no protection level disposable children mask filtering effect high implementation standard gb/t38880-2020 scope of application dust prevention and anti-flying foam and other special services contact customer service before placing an order item no. 1 size 14.1 * 9cm wearing mode hanging ear order no. 111 breathing valve no folding mode flat nose c