General description Made of high-quality materials, this filter core is designed for sweeping robots 690, 529, 620, 630, and 650. It effectively filters fine dust, reducing the amount of dust and pollen that enters the air you breathe. Regular maintenance is essential for optimal performance. Technical specifications Material: Plastic Package Contents: 20 x Filter Measurement allowed error: +/- 1-3 cm Usage Can be easily removed and replaced as part of normal maintenance. It is recommended to replace spare parts every 2 to 3 months to maintain optimal performance. Other information Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product.