Replacement parts fit for 900901 robot vacuum cleaner Keep for 900 901 robot vacuum cleaner operating at peak performance by changing the consumable replenishment kit every 2-3 months, depending on your usage frequency. Color: Gray Material: Plastic Package Contents: 4 x Main Brush 6 x Filters 12 x Side Brush Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.