Compatibility: Anker eufy roller mop, 1 pack, compatible with E35, E25, E28, S1 Pro, S1, and S2. Polyester and Nylon Material: Durable polyester and nylon construction resists wear while protecting floors from damage. Effective Cleaning：The roller mop cleans dust, dirt, and debris efficiently, ensuring optimal performance. Suggested Replacement: Replace every 2 months, depending on usage. Genuine Anker eufy Accessory: To protect your robot vacuum and extend its lifespan, we recommend using genuine replacement parts. Third-party alternatives may not be compatible and may affect performance. Note: The packaging of the accessories you receive may vary. Rest assured, all accessories are genuine Anker eufy products.