This is a H13 True HEPA Air Purifier Filter Replacement designed for Aroeve MK04/MG04JH/DH-JH04 models. The filter is pleated, comes in a pack of 2, and has a blue color. It uses True HEPA filtration technology, making it suitable for air purification purposes. 4 Packs of 2 are available. Buy are 4 and save on shipping.