Filter Kit: Works together to help for your IW3511 Detect Pro Vacuum or IW1111 Vacuum work better, and keep your room clean and comfortable. Washable: Filters are reusable, just use water for cleaning, then reuse after drying completely. It is recommended to replace the filter every 1-3 months, depending on the frequency of use. Please note; the physical slightly color difference or difference, does not affect the use, please do not mind, thank you! Fit Model: IW3511 Filter Kit Fit for IW1111 Detect Pro Cordless Stick, Fit for IW3511 Vacuum Material: plastic colour: Black Package Contents: 4 x HEPA 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 the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.