Compatibility: Our pre-filters are compatible with A10 Hero/Master and A11 Hero/Master cordless vacuum cleaners, for S11/S12 series cordless vacuum cleaners. High-quality material: It is made of high-quality plastic material, with good durability and stability. To ensure the operation of your vacuum cleaner, it is recommended to replace the A10 filter every 1 to 4 months depending on your usage. Washable: Pleated or sponge filter can be washable. Completely air dry the filter for at least 24 hours before putting it back into your handheld vacuum cleaner. Easy to install: Remove the dust container from the cleaner, remove the old filter. Install the new filter in place. Replace the filter regularly, ensure your vacuum cleaner provides the best cleaning performance. Free your hands from complicated replacement steps. No additional tools required. Convenient: HEPA filter captures 99.99% of particles ejected during cleaning, including particles as small as 0.3 microns, expels fresh,