General description These replacement roller brushes are designed for Roomba 800, 900, 850, 860, 861, 866, 870, 880, 890, 960, 980, 981, and 985 series vacuum cleaners. They fit perfectly and function like the original brushes, ensuring efficient cleaning performance. Technical specifications Compatible with Roomba 800, 900, 850, 860, 861, 866, 870, 880, 890, 960, 980, 981, and 985 series Made of durable and environmentally friendly materials Usage To maintain optimal suction power, it is recommended to replace the bristle brush and beater brush every 6 months. For households with pets, consider a shorter replacement cycle.