Quote:
Originally Posted by swarmee
BGS does it with every card, so at least they're consistent.
PSA does it when the card doesn't fit the holder perfectly and they either need to hold it in place. Sometimes they do it when the card is fragile and might get more damaged in the holder. You can make the request on a submission (or a reslabbing) that they not use "mylar sleeves" but it is up to the person who is actually putting your cards in the holder.
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Thank you John! That makes sense.