accessories- HEPA air filter can more effectively adsorb harmful particles and gases, filter particles above 0.3 microns in 30mins.Apply Air Filter: Melt blown electrostatic layer+ HEPA Filter layer+ Nutshell activated carbon. main goal: Premium HEPA Cabin Filters prevents harmful fine particles and dust from entering the vehicle cabin while keeping clean and healthy environment to passengers.Suggestion from Car-care experts and cabin filter manufacturers: Replace 8-12 months or 12,000 to 15,000 miles, especially desert and wet areas.With high density electrostatic electret filter and Honeycomb Design: more filtering power and a service life. We have maximized the filtration area in cabin filters without affecting the -flow of air into the passengers' cabin.advantages:Easy to InstallIt's installed with no tools, and when replace the filters, they can be removed by using finger to pull out.Compared to competitors, ours are easier to pull out and will not be affected by slipping .The black part is be facing toward the car .The white part is be facing toward the car frunk.Applicable models:For Model 3For Model Xcolour: white + blackMaterial: HEPAPackage Contents: 2* Air Filter