1. Material: sponge 2. Suitable for vacuum cleaners such as Shark AH400/AH401/AH405/AH454/AH400C/AH401C/AH454Q/XFFH400/XEXFH400 3. Real machine opening film, highly matching 4. The sponge is made of polyester material, which is strong and durable 5. Suggestion: clean after 1-3 times after use (specifically based on the amount of cleaning in your home) 6. Regular replacement can maintain the performance of household robots 7. Size: about 6 cm 8. Weight: about 5g