The breath square mask regular kit is a breath silver edition that contains 7 packs of masks (3 masks per pack), 1 essential mask case (random select bts member) and 1 essential mask necklace. Breaxell nano-fiber effectively blocks airborne particles due to it's ultra-thin fiber composition and evenly dispersed tiny air pores with a diameter of around 0.0001mm. numerous and evenly distributed air pores provide for high porosity and excellent permeability. Highly porous structure help maintain comfort and freshness. Designed for protection against harmful air-borne particles, pollen and dust.