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Posted By: warshawlaw

As pointed out, the holders put pressure on the corners. I'v had two forms of damage:

(1) If there are any specks of dirt, dust, etc. on the holder, the pressure can embed them into the card. I had a very high end 1950's HOFer card (can't recall which one now) that had a speck of black dirt embedded into a white border that way. When I carefully removed the speck, I had a permanent divot in the border.

(2) If the card has thicker stock, the uneven pressure can put hairline creases into the card over time. Had a beautiful Hank Greenberg develop "wrinkles" from this.

My advice: if you are holdering the cards for your own use, just send them to SGC and have them slabbed. The protection is great and they look really good in the holders (I will probably submit my entire T206 collection one day, when I am truly bored and they have a good special running).