High material: It is made of high-quality material, with good durability and stability. Good elasticity, uniform thickness, and compliance with production standards.Recommend to replace the A10 filter every 2-4 months depending on usage. Compatibility: Our Pre Filters Compatible with A10 Hero/Master and A11 Hero/Master Cordless Vacuum Cleaner,for S11/S12 Series Cordless Vacuum Cleaner. HEPA technology: Filter out most of the dust, pollen, smoke, odor, mold spores and pet dander. The air filter captures particles as small as 0.3 Micrometres and larger, which helps to improve health. Easy to Install: Remove the dirt cup from the cleaner, remove the old filter. Install the new filter in place.Replace the filter regularly, make your vacuum providing best cleaning performance.Free your hands from the complicated replacement steps. No extra tools needed. Keep air: It can filter out harmful odors in the air, which is very suitable for people who want to keep the air and control the air quality. It is an Perfect accessory for vacuuming and can the safety of the surrounding environment. Colour:Photo Color Material:plastic Package Contents: 2 x pre-filters 2 x post filters (1 each for white/blue) Only 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.