GOOD FIT: This A10/A11 Pre Filter fits for A10/A11 Hero, A10/A11 Master, for S11 Series Cordless Vacuum Cleaners, helps your vacuum run back to level. DESIGN: 3 pieces A10 filters in one set help you always have one filter ready to use. Just say goodbye to the days when you have to worry about the lack of extra filters. Quality above all: Made from state-of-the-art high-strength materials, the A11 filters are designed to outlast. Easy to install: Free your hands from the complicated replacement steps. No additional tools required. Friendly Reminder: To your vacuum cleaner works properly and optimally, it is recommended to replace the A10 filter every 1-4 months depending on use. Colour: gray Material: plastic Package Contents: 3 * Vacuum filter 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.