Compatible with : This replacement parts kit compatible with i7(7150) i7+ Plus(7550) i6(6150) i6+ Plus(6550) i8(8150) i8+ Plus(8550) i3(3150) i3+ Plus(3550) i4(4150) i4+ Plus(4550) E5(5134) E6(6198) vacuum robot cleaner Premium Quality&Replacement Frequency : Made with high-quality materials,Side Brush guarantees 2-4 months long-lasting use, wear resistance and Hot water to maintenance.Recommend to replace the spare parts every 2-4 months to keep your Robotics cleaner working with High-Performance. Replacement side brush parts are easy to install and fit precisely. When the bristles of the side brush are bent, you can add an appropriate amount of warm water to the cup and soak the bristles for a few minutes to recover. High Efficiency Filtration:Brush can capture variety of debris, dirt, dust, pet hair and other small particles. The side brush reaches deep into corners and edges to remove more dirt, dust and debris. Important Notice : If the side brushes are bent or curled due to shipping, please recover them by simply soaking them in warm water for several minutes. It will not affect the quality and performance.