These SEBO Filter Bags fit the Automatic X Series, the Airbelt C series, and the Essential G series, as well as the 370 upright vacuum.  The bags are a cloth-like material to keep all the dirt and debris you suck up in your vacuum and not in your home.  The green plastic tab on the top provides a tight seal around the opening to keep the bag on and the dirt in.  This package has 8 bags, so you won't run out any time soon!