Filters maintain the cleaning efficiency of the robot, reducing the ingress of dust, pollen and other allergens to the air. The accessories should be replaced every 2 to 3 months. All the parts are made of high-strength and environmentally friendly materials. it's easy to remove dirt, dust, and trash in corners and edges from the accessories, especially human hair and pet's hair. Accessories parts are durable and easy to install Alternative compatible Dyson 970422-01 Fits: compatible Dyson Outsize,V11 Outsize,V11 Outsize Origin,Outsize Absolute+ : Material:plastic Package Contents: 2 x vacuum filter 1 x clean brush 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. The measurement allowed error is +/- 1-3cm.