Oreck BB Micro Filtration Bag, 12 Bags Treated with Ultra-Fresh for Models PKBB12OF and PKBB12DW ORECK Buster B and Buster B Housekeeper (BB180, BB280, BB850, BB880, BB900, BB1000, BB1100, BB1200, MV160, CC160) and XLPro (XLPRO5) Canisters Micro Filtration vacuum bags also capture 99% of particles 5 microns in size, including household fibers and other microscopic allergens The Ultra-Fresh finish on these bags protect against odor and stain-causing microbial growth; This helps keep your bag cleaner and fresher Ultra-Fresh treated bags are guaranteed from defects