It doesn't matter, I just bought one for my license and certificate. I also bought a leather case for each, which were supposedly made of genuine leather. Now I think it was a complete waste of money.
The license card is a hard card, which makes it easy to store. As for the license itself, I fold it in half and place a piece of paper between the two sides. This is to prevent the ink from transferring to the other side over time, thus protecting the surface of the license.
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