Fit Model: Compatible With iRobot Roomba Essential Series Essential 2(Q0520) 105 Vac Q0120 Y0140 Y0110 Q011 Vacuum Cleaner Durable Material: The replacement parts kit is made of high-strength materials, For best results, edge-sweeping brushes and filters should be replaced every 2 - 3 months. Multi-surface brushes should be replaced every 6 months. Tips: 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. Valuable Package: Includes 2 Roller Brushes,4 Filters,8 Side Brushes