"The initials are on the box as vinyl. I don't expect they will stay on long. I bought as gifts for my bridesmaids. Ships from Portugal so it does take a little while
**** EDITED REVIEW*** I'm editing after getting some feedback from the seller in regards to thinking the lettering might fall off. She wanted to put my mind at ease about the writing, it is heat applied for a permanent finish and will never come off. She also let me know it is not a vinyl sticker. She also seems very friendly and easy to work with because she mentions if any of the letters do somehow fall off she would be willing to help provide a replacement."
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