The MB filter made by BLADE Entertainment is 100% domestically manufactured, uses the best domestic raw materials, and is produced in the best facilities with German spinning nozzles and the new 8130A model facility of TSI developed in the U.S. Formaldehyde PH levels are being managed at a range that is harmless to the human body, and we are making every effort to manufacture safe products by introducing systems for control of fine dust, pollutants, and pests.