This item is a genuine, original Luftschutz VM37, VM40, and VM39 gas mask replacement anti-fog inserts. The inserts are designed to fit perfectly into the gas mask, providing clear vision and protection in hazardous environments. These inserts are ideal for collectors, historians, and enthusiasts of militaria from Germany during the World War II (1939-45) era who are looking for original, authentic pieces to add to their collections.