This pack of 4 filters provides a replacement solution to help maintain strong suction and clean airflow in your bObsweep Dustin Plus. Made of high-quality fine dust particle trapping material, each filter captures allergens and microscopic particles, helping reduce airborne debris while keeping your cleaning system running efficiently. It is recommended to replace the filter once every 4-6 months. Compatible with: bObsweep Dustin Plus. bObsweep