The DreamStation 2 ultra-fine disposable filter by Philips Respironics is a white, one-time-use ultra-fine filter designed to prevent dust and other minute particles from entering the CPAP machine. It is specially designed for use with Respironics DreamStation 2 CPAP and BiLevel machines and is not compatible with DreamStation and DreamStation Go Series. These filters are genuine Respironics DreamStation 2 filters and are packaged in a carrier with a light blue color. Pay by insurance? Please call (877) 799-0202.