General description High-quality roller brush and HEPA filter accessories designed for models 3930F, 3933, 3999z, 4017N, and V2 OmniForce Edge. These components effectively filter fine dust, reducing dust, pollen, and other allergens from the air you breathe. Technical specifications Material: Plastic Package Contents: 2 roller brushes, 10 HEPA filters Measurement allowed error: +/- 1-3 cm Installation Easy to remove and replace as part of normal maintenance. Recommended replacement every 2 to 3 months for 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.