Compatible with IW3511. Please note to check the size and model of the vacuum cleaners before ordering. Great value combo set to keep your room clean and comfortable. Washable and reusable. Rinse with water and let air dry completely before reusing the filter. For optimal performance, it is recommended to change this filter set once every 1 to 3 months. Easy to replace and install, when it needs replacing, simply remove and replace it from your machine's equipment, no tools required. Please note; The physical color difference or difference does not affect the use, please don't worry! Material: plastic color: as shown Package Contents: 2 x black filter elements 2 x black filter cotton 2 x aromatherapy 2 x curved filters 2 sets of filter cotton 2 x high efficiency filters Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is