Set of Replacement Parts for iRobot Roomba S Series (S9 / S9 ) - Replacements. This set of replacements is specially designed to ensure long-lasting and effective operation of your iRobot Roomba S-series robot. The kit includes key consumable parts that will help maintain the high quality cleaning of your iRobot Roomba s9, s9 , s9150 and s9550. Included are: 2 x 5-arm side brush: Effectively sweeps debris from corners and edges, directing it toward the main brushes. 2 x Filter: High-quality filters capture fine dust particles, allergens and pollen for cleaner air in your home. 2 x Roller - Main Brush: Two main rollers work together to effectively pick up dirt, dust and dander from a variety of surfaces. Compatibility: iRobot Roomba S-series: s9, s9 , s9150, s9550