20pcs Total - Replenishment 10 Pcs Side Brush and 10pcs Filter for Irobot Roomba Vacuum Cleaner 500 530 550 560 Series Brand new side brush and filter for irobot roomba 500 530 550 560 series Compatible for irobot vacuum cleaner100% Compatibility Guaranteen. Made of high-strength and environmental protection material Helps keep vacuum cleaner in good working order Item includes 10pcs side brush and 10pcs filter for 500 530 550 560 series.