Product description Material: plastic + filter cotton Quantity: 11 sets Packing list: 3x filters, 3x side brush, 2x main brush, 3x screws 1.Compatible with: For i7 vacuum cleaners. Packing list:3x filters, 3x side brush, 2x main brush, 3x screws. 2.Premium quality: Highly efficient filter materials are made of high strength, environmentally friendly materials, can block 99% with diameters of only 10 microns dust, mites, allergens and dirt. It is recommended to replace the filter every 2 months, change the side brushes every 3 months, the roller brush is replaced every 6 months, depending on your usage. 3.Easy to install: Snap into place for quick and effortless replacement. No tools required, filter and brush easily replaceable. Accessory is easy to install and durable, allows effective removal of dirt and dust in corners and edges. 4.Easy to useThe innovative brush reaches deep into corners and edges to remove more dirt, dust and dirt. It can be easily removed and replaced during routine maintenance. 5.Efficient cleaning abilityThe floating main brush structure adapts to the cleaning of the floor and effectively squeezes the gap between the floor tile and the carpet edge into the dust box. It does not deform the floor and produces excessive noise.