General description 100% new and high quality. Made of high-quality materials, this roller brush and HEPA filter set effectively filters fine dust, reducing dust, pollen, and other allergens from penetrating into the air you breathe. Technical specifications Material: Plastic Package Contents: 2 roller brushes, 4 HEPA filters Measurement allowed error: +/- 1-3 cm Usage As part of normal maintenance, the filters can be easily removed and replaced. It is recommended to replace spare parts every 2 to 3 months to maintain optimal machine performance.