Clean brushes keep your home robot running at peak performance. Side brushes are easy to remove and replace as part of routine maintenance. Replacement filters for S50 S51 robot vacuum cleaners. Filters maintain the robot's cleaning performance while reducing infiltration of dust, pollen, and other allergens into the air you breathe. For best results, filters should be replaced every 2 to 3 months. Size: 20 * 15 * 5cm Color: orange + white Material: plastic Package Contents: 6 * side brush 2 * main brush 4 * filter Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. thing. The measurement allowed error is +/- 1-3 cm.