Product Features: - The Package Consists Of 3 Types Of Filters, 2 For Small Particles And 1 For Large Particles. - Easy To Clean And Install, Also It Extends The Lifespan Of The Electric Vacuum Cleaner. - Provides H12 Filtration Feature. - Pre-Hepa Filters For Small Particles Can Be Replaced Every 9 Months. - For Large Particle Hepa Filters, Replacement Is Required Every 18 Months. - Designed For Easy Washing And Use, You Can Reinstall The Hepa Filter Even If It'S Slightly Damp.