Patented DuraFlex® self-supporting media provides uniform pleat height, width, and spacing without the need for wire support. The PerfectPleat Filters are all equipped with a state-of-the-art support strap bonded to the pleat tips to ensure uniform pleat spacing while adding rigidity and support to the media pack. Under careful construction, all materials and process used to create the PerfectPleat are precisely matched to create a filter that has superb fit and finish to match its durability. 100% synthetic fibers provides better air flow and naturally resists microbial growth. New, patent-pending, sonically-welded, strong pinch frame design. Helps heating and cooling systems operate more efficiently. Residential/Commercial. MERV 7. Lasts 90 days.