50шт/комплект запасная часть нетканые одноразовые маски пусковая площадка анти-пыли защитная дышащая 12 х 13 см

precautions: it is recommended to replace it every 2 hours, up to no more than 4 hours. when to replace the mask pad? use disposable mask pads during work hours, one can be topped with 3-5 masks; mask pads should be replaced once on the way to and from work. after arriving at the destination, by replacing the mask pads, one mask can meet the needs of one day's work. specification: product name: disposable mask pad material: non-woven color: white size: about 12 x 13cm(l*w)