Package: 20 pieces of Karcher WD3 paper filter bags/vacuum cleaner bags 6.959-130.0. To maintain the performance and longevity of your vacuum cleaner, we recommend replacing the WD3 dust bag every 2-3 months for optimal performance. High-quality material: The high-quality MV3P filter bag is made of 2 layers of microfiltration paper and environmentally friendly materials. It is thick, stable, reliable, tear-resistant, and durable, with a filtration efficiency of up to 99.99%. Wide compatibility: Compatible with Karcher WD 3 Battery/WD 3 Battery Premium/WD 3 Battery Premium Set/WD 3 Battery Set vacuum cleaners, also compatible with A2201/2204/2504/2554/2251/2604. SE4001/SE4002 Easy to use: The Kärcher WD3 vacuum cleaner bag can be used in a variety of ways, both indoors and outdoors. You can easily install the bag in your vacuum cleaner. Customer service: If you have any questions about our products or are unsure about product compatibility, please contact us promptly and we will assist