pre-filter.(Please check the model you need before purchase) 3-Stage Filtration: MA-15 replacement filter has a high-density nylon pre-filter that can trap large particles, H13 true HEPA 99.9% particle removal for filter and high-efficiency coconut shell activated carbon filter that can remove odors.Provide a comfortable and safe environment for your children and family. Filters: MA-15 Filters are made of filtration systems including Pre-Filter, True HEPA Filter and Activated Carbon Filter.Fine Pre-Filter remove large particles such as hair, pet fur, dander and lint. Easy to install and clean: Easy to install, no tools required. Color: As Shown Material: Activated Carbon Package Contents: 4 x Air Purifiers Filters. Only the above package content, other products are not included. Note: Light reflection 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.