I have an odd question and seriously dont know so....

I am going to ask the board. I am not new to collecting but new to the grading process and graded cards. I am very curious why is that the psa cards I have seen either the card is loose in the holder or something with the case is shaking? I looked at the other companies and the card or holder didn't seem to rattle. I am wondering if it just the psa cards that I have seen do that or do they all do that? And is it the card that is shaking? Sorry to ask something like this if it is common knowledge or something but I have no idea? Thank you in advance to let me know what the deal is.........
Josh
Josh
"If someone tells you that money is the root of all evil. They don't have any"
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Comments
Some misses of the PSA holders and grading process:
-wiggle room for cards
-not vacuum sealed to keep out harmful environmental elements that could harm the cardboard
-cards are handled with gloveless hands while grading. Finger prints get on cards and then the acid within the print print residue eats away at the cardboard eventually.
-no UV protection built into the PSA holders
BST: Tennessebanker, Downtown1974, LarkinCollector, nendee
randy
I would prefer a case that covers everything DeutscherGeist notes but I wonder how much cost difference that would be. I think they could do away with the wiggle room and add vacuum sealing at little or no extra cost.
Mark
Raw: Tony Gonzalez (low #'d cards, and especially 1/1's) and Steve Young.