Pre Filter for Dyson DC19 DC20 DC21 Vacuum CleanerReplacement filter with high dust retention, dirt does not stand a chanceThe filters work while you vacuum, remove household dirt and dust to improve air quality, providing a healthier environmentTo keep your cleaner running at peak performance, please replace your filter every 2 - 3 month.colour: bluematerial: plasticPackage Contents: 3*FiltersOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.