There is one brush each for the right and left sides. They were stored without being used. iLife Robot Vacuum Cleaner Parts Brush Filter Bundle New, Unused A6 A4s Compatible models: Robot vacuum cleaners A6, A4, A4s, A4e. These are compatible replacement parts. Easy to install, no tools required. Clean the side brushes every 1-3 cycles. Maintenance: To achieve good cleaning results, side brushes and filters should be replaced every 2-3 months. [Side Brush Notes] If the edge cleaning brush bristles are bent, soak them in warm water for about 4 minutes, then take them out and thoroughly remove the water. The edge brush will straighten. Please purchase only if you understand that these items have been stored by a private individual.