These genuine filters are specifically designed for ELECTROLUX Ergorapido vacuum cleaners ZB 2811... 2813, ZB 2815, ZB 2820, 2821, ZB 2901...2908, ZB 2923, 2924, 2925, 2929, ZB 2932... 2935, ZB 2941...2945. These filters protect your Ergorapido motor from dust particles. These filters are easy to clean and resilient. However, if broken, you need to replace them in order for your vacuum cleaner to have high airflow and strong suction power. Here are some tips to best maintain your new Ergorapido filters: Pull the spring above a dustbin to remove the dust on the filter every time you empty the dust container. Wash filters after every 5th dustbin empty. To wash filters rinse in lukewarm water without detergent. Shake off excess water and leave to dry for minimum of 12 hours. Ensure the filters are completely dry before putting them back into the vacuum cleaner. This pack contains one Ergorapido inner filter and one outer filter. ELECTROLUX filter pack reference: EF 141.