This is an edge cleaning brush for the Roomba 500/600/700/800/900 series. Compatible with both "Blue Side Brush Module" and "Gray Side Brush Module" products. Compatible models include: 510 527 530J 531 537 550 551 560 561 570J 577 606 620 621 622 623 624 625 626 627 628 629 630 631 641 642 671 680 690 691 692 760 770 780 790 870 871 875 876 878 880 885 890 960 980, and all other models in the 500/600/700/800/900 series. Product Description: This is an edge cleaning brush for Roomba that rotates to sweep debris from walls and corners of the room forward. Product Features: (1) Quality equivalent to genuine products (2) Improved to prevent the edge brush bristles from falling out (3) Easy to replace Replacement Method: Loosen the screw of the edge cleaning brush and remove it. Attach the new edge cleaning brush to the original location while pressing it in, and tighten it with the included screw. Replacing it regularly will restore the suction power. Includes 2 brushes and 2 screws.