New open box. X1 opened but unused. The AP303 AP304 Replacement H14 HEPA Air Purifier Filters by APRIL-FLOWER are a 4-pack of white filters designed for air purifiers. These filters utilize activated carbon filtration technology to effectively clean the air of impurities and contaminants. Perfect for maintaining indoor air quality, these filters are efficient and reliable in improving the overall air purity of any space.