Festool's 5-pack CT 26 Self-Cleaning Filter Bags capture and contain dust and debris, helping you work cleaner and more efficiently. They serves as the primary, or first stage filter, trapping particles down to 5 microns in size. These filter bags prevent dust from reaching the main filter of the dust extractor, greatly extending the life of the main filter and CT unit. Each filter bag decompresses upon shutoff, breaking up internal dust caking to ensure full suction until the bag is completely full. It is composed of durable, fleece-like material that prevents rips or tears, keeping dust fully contained and off your floor. The integrated closure ensures that dust stays put for clean disposal. Includes 5 replaceable bags.