Nothing, they work. There are a few aspects that make them quite impractical. I ordered a white set. Good luck everyone trying to peel the white letters off the white background. I read the reviews about the background issue before purchasing the product but didn't really think much about it. It is very difficult to remove the letters due to the background. My second issue with them is the inconsistent number of letters. For example, there are three letters "L" and two letters "K". The discrepancy between the number of letters makes it difficult to use labels for the second character or call sign, which may require more than two of each letter. All in all they will work. I would recommend getting an extra set so you don't have a useless sheet if the letter gets mixed up because the customer couldn't remove it from an indistinguishable background color.
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