Compatible Model: The air purifier filter replacement is ONLY compatible with Sharper Image PURIFY 3 air purifier, part # MD1-0043 & MD1-0044 (Please confirm your machine model before buying!) Value Pack: Package includes 2 pack MD1-0043 HEPA filters and 4 pack MD1-0044 activated carbon replacement filters. Easy to install, snaps into place, no tools required High-Efficient Filtration System: The high efficient filtration system including high quality HEPA filter, Pre-filter and high efficiency activated carbon filter. The HEPA filter can capture the larger particles in the air, such as dust, hair, pet fur and more. Activated carbon filters adsorb larger airborne particles and eliminate odors like smoke.