Compatible with for A10/A11 Master , A10/A11 Hero, A10 Dash, S11 series cordless vacuum cleaners. Changing the pre-filter over time can improve the life of your vacuum cleaner. To maintain better cleaning of the indoor environment. Simple and easy to install. Prepare the replacement of the screwdriver. Materials used to produce high-quality materials, pleasing shape, sophisticated manufacturing. Replacement is recommended 1-4 months. Depending on how you use the vacuum cleaner. Color: GreyMaterial: Plastic Package Content: 1 * Filter ElementsOnly the above package content, other products are not included. Note: The light and different displays may cause the color of the item in the picture to be slightly different from the real thing. The allowed measurement error is +/- 1-3cm.