Household air conditioners and air purifiers mix the air inside the room by heating changes, so the filters inside the air conditioner and inside the air purifier are easy to get a variety of dirt and other contaminants. By attaching the "serious" to the air conditioner filter with the included tape, it reduces the buildup of dirt in your air conditioner or air purifier, and reduces the hassle of cleaning. Made of dense, non-woven fabric that does not interfere with the intake of air conditioning equipment and is comfortable to use. The "Mamori" material is made of rayon non-woven fabric that is treated using the unique technology of NBC Mesh Tech, which is a proprietary technology that is Cufitec, which is highly antiviral and antibacterial effects. If it gets wet with water, there will be a copper smell, but the quality is not affected due to the reaction of copper compounds. *If exposed to sunlight for a long time, copper compound may react and turn green; but it does not affect its quality. The rest of the cut "Mamorina" can be used for wiping and cleaning.