FEATURE 1200+ IAV High Quality Australian Virgin Activated Carbon from Western Australia ,odor removal 99.9% light weight and highly efficient for enclosed environments 1.6 mm aluminum tops and bases for reduces weight,Averaging half the weight compare with other filter make it a shiny filter More air flow from larger open custom mesh for extended life,using the entire filter area Inner and outer mesh with 53% open area allows for increased air flow.have an lasting performance Two free pre filters Washable included,Replacement carbon sleeves are available to make them last even longer