General description Brush Roll Replacement Part for K30/K30 Mix is designed to maintain the cleaning efficiency of your robot while minimizing the ingress of dust, pollen, and other allergens into the air you breathe. For optimal performance, it is recommended to replace the brush every 2 to 3 months. Technical specifications Applicable Models: K30 Material: Plastic Package Contents: 1 rolling brush, 2 filters Allowed measurement error: +/- 1-3 cm