WHAT ONE MEANS SERIOUSLY, ONE SAYS BEST IN JEST. Wilhelm Busch High-quality folding cards in DIN A6 format Our folding cards are made of high-quality cardboard and are FSC-certified. They are robust and tear-resistant, making them durable even with frequent use. Each folding card is individually wrapped in foil to protect it from dirt and damage. Additionally, it comes with a color-coordinated envelope that can also be used as gift packaging.