Compatible with for IW3511. Please note check vacuums in size, model before order.combo set to keep your room clean and comfortable.Washable Reusable. Rinse with clean water and let it completelyair dry before reusing filter. For optimal performance, it is recommended to change this filter set once every 1-3 months.Easy to Replace and Install, When it needs to be replaced, just remove and replace from your machine equipment, no tools required.Please note; the physical slightly color difference or difference, does not affect the use, please do not mind, thank you!Material: plasticcolour: As ShownPackage Contents:2 x Black filter elements2 x black filter cotton2 x aromatherapy2 x curved filters2 sets filter cotton2 x high efficiency filtersOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.