Sebo's filtration system ensures high filtration to remove dust, dirt, and allergy-causing particles without recirculating it into the living areas. This box of vacuum cleaner bags contains 8 Sebo D4 Series Ultra Filter Bags. Attached to the green plastic collar is a vacuum bag plastic cover to prevent the dirt from escaping the bag when being thrown in the trash in order to help those with allergies not come in contact with the dirt they have already vacuumed.