Fit Model: 496186 SELFCLEAN Filter Bag Compatible with Festool CT 36, Festool 577084 CT 36 E, Festool 576760 CT 36 AC Dust Extractor. Package Included: 5 Pack 496186 SELFCLEAN Filter Bags. (The use of self-cleaning filter material optimizes the utilization of filter bag volume, and is foldable and large-capacity) STORAGE & USE: The 496186 SELFCLEAN Filter Bags Spare Parts should be stored in a dry place. We recommend replacing every 3-6 months. Efficient Experience: remove dust and stains from the floor, 36+ months of use, time may vary based on your vacuum work environment. Satisfaction Guaranteed: If you have questions or concerns, our customer service team will give you a satisfactory solution.