Compatibility: Intended for selected robot vacuum models only; compare the original roller length, end-cap design, drive-side interface, and brush-cover fitting before ordering. Replacement Use: Use this main roller brush as a maintenance spare when the original brush is worn, bent, or damaged. Roller Structure: This listing is for a roller-style main brush; bristle pattern, rubber-strip layout, and end-cap design depend on the selected option. Package Contents: Pack quantity and included components follow the selected option and product images; the robot vacuum and unshown accessories are not included. Check Before Ordering: Confirm the robot model, roller size, end-cap shape, drive coupling, brush-cover fitting, and selected pack quantity.