Essential accessories- HEPA air filter can more effectively adsorb harmful particles and gases, filter particles above 0.3 Micrometres in 30mins. Apply High Quality Air Filter: Melt blown electrostatic layer+ HEPA Filter layer+ Nutshell activated carbon. Our 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 every 8-12 months or every 12,000 to 15,000 miles, especially desert and wet areas. With high density electrostatic electret filter and special Honeycomb Design: provide more filtering power and a longer service life. We have maximized the filtration area in our cabin filters without affecting the free-flow of air into the passengers' cabin. Color: black + white Material: fiber cloth Advantages: HEPA=High Efficiency Particulate Air Filter In 30mins, it can filter particles above 0.3 Micrometres without affecting the free-flow of air into the passengers' cabin. Easy to Install It's easily installed with no tools, and when replace the filters, they can be easily removed by using finger to pull out. Compared to competitors, ours are easier to pull out and not be affected by slipping fingers. The black part is be facing toward the car seat. The white part is be facing toward the car frunk. Package Contents:4 x Car Air-Filter Only the above package content, other products are not included. Note: Light 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.