Fully compatible, high quality and durable filters. Replacement washable pre-motor filter, post-motor allergy HEPA filter kit for Dyson vacuum cleaners. Yellow pre-motor washable lifetime filter diameter: 153mm; Blue post-motor HEPA allergy filter diameter: 151mm. Easy to remove and replace as part of routine maintenance. To keep your cleaner running at peak performance, please replace your filter every 2-3 months. Package includes: 2 filters/set for Dyson vacuum cleaner filter kit.