These Riccar Type B Vacuum Bags fit Riccar and Simplicity models that use Type B bags. Each package includes 12 Micro-Filtration vacuum bags, which provide 99.7% filtration to trap microscopic particles and allergens. For optimum performance, it is suggested to change your bag every 1-2 months! By retaining dust, pollen and other particulates and allergens from the air while you vacuum, these vacuum bags make the air in your home or business cleaner and more breathable. Fits Simplicity 7 Series (7700, 7750, 7850, etc.), Simplicity 7000 Series (7200, 7250, 7300, 7350, etc.), Simplicity Commercial Models (7400, 7450, 7900, 7950, etc.), Riccar 8000 series (8715, 8750, 8625, 8650, 8800, 8850, 8800), 8600 series (8625A, 8650A, 8715A, 8750A, 8850A), 8900 series (8900, 8920, 8905, 8955, 8925)