Eliminate dust and pollen from the air and tame your allergies! Frost King Window Air Conditioner Filter is made of Polyurethane, which will trap dust and pollen, and prevent it from entering your home. Polyurethane foam will reduce loss of heat to conserve energy, create a sound barrier to control noise, and reduce mold and mildew as polyurethane sheeting helps to control water flow and condensation. The foam can be cut to any size with an ordinary pair of scissors. Just use your filter as a template, cut the replacement filter to the right size and slip it into place in you air conditioner. The filter should be cleaned periodically to keep it functioning efficiently. To clean, just remove the filter from the unit, wash with a mild detergent solution and rinse clean. Shake off excess water and air dry before re-inserting. Each package contains two. Black, 24x15x.25 Inch piece.