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 Compatible compatible Dreame D9 compatible Dreame D9 Max : Material:plastic Package Contents: 2 x side brush 2 x hepa filter 1 x main brush cover 1 x wheel 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.