ITEM NAME:Sweeping Robot Parts ILIFE A4 Replacement Kits Side Brush Hepa Filter Roller - Description: Side Brush HEPA Filter Roller Brush set compatible with ILIFE Model A4 pro Robotic Vacuum Cleaner The brush should be replaced every 2 - 3 months to keep operating at peak performance Easy to remove and replace as part of routine maintenance The brush are made of high-strength and environmentally Friendly protection material. please note that there are 2 types of brushes for ilife a4. you should confirm the shape of one side of your original brush (to be the same as the yellow brush in the left) when you purchase it. only the same shape can be used. Specification: Material:Hepa,Plastic,Nylon Size Chart: Roller Brush:Approx. 120x40mm/4.72x1.57inch Hepa Filter:Approx. 135x50mm/5.31x1.97inch Side Brush:Approx. 160mm/6.30inch Package Includes: 4 Pieces Side Brush(L+R) 2 Pieces Hepa Filter 1 Pieces Roller Brush SKU: ALU0001100970006418.Side Brush HEPA Filter Roller Brush set compatible with ILIFE Model A4 pro Robotic Vacuum Cleaner. Material:Hepa,Plastic,Nylon. Hepa Filter:Approx. 2 Pieces Hepa Filter. Roller Brush:Approx. 1 Pieces Roller Brush.