Compatible with for A10/A11 Master , A10/A11 Hero, A10 Dash, PURE ONE S11 Series Cordless Vacuum Cleaners.Changing the pre filter in time can improve the life of the vacuum cleaner. To keep the better cleaning indoor environment.Simple and easy to install. Prepare a screwdriver before replacement.Materials used to produce high-quality materials, shape pleasing, sophisticated production.Replacement is recommended every 1-4 months. according to how you use the vacuum cleaner.Colour: grayMaterial: plasticPackage Contents:1 * Filter elementsOnly the above package content, other products are not included.Note: Light 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.