The DreamStation 2 Style reusable filter by Sunset Healthcare Solutions is a reusable foam pollen filter made of synthesized fibers designed to remove larger particles like irritation dust and pollen from entering the CPAP machine, helping maintain clean and effective air delivery during therapy. This product has a single filter in the package and is compatible with all DreamStation 2 CPAP & BiLevel machines. Pay by insurance? Please call (877) 799-0202.