The paper bags are designed to fit your ELECTROLUX Central Vac CV 721. ELECTROLUX high quality paper bags have been created to fit your central vac and maintain its best performance. The high grade of material used for these paper bags provides your central vac with high airflow and strong suction power as well as a high filtration level and maximum dust retention. To preserve optimum performance, we recommend you to change paper bags regularly. The use of non genuine vacuum bags may adversely affect your central vac. This pack contains 5 paper bags. ELECTROLUX paper bags reference: E57N.