Filtrete Vacuum Bags are guaranteed to be free from defects in material and workmandship * Filtrete Micro Allergen Vacuum Bags capture 90% of particles larger than 1 micron in size, including dust mite debris, grass and ragweed pollen * Filtrete Vacuum Bags treated with Ultra-Fresh Antimicrobial protect agains odor and stain causing microbial growth - keeping your bag fresher * Vacuum Bags should be replaced every 30 to 60 days for optimium performance