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The sleeves i use are frustratingly slippery to each other. There is absolutely no sticking lol they slide right off each other, and drive me crazy if i am trying to work on a stack. Whats odd, is my coin flips and my currency sleeves are 'supposedly' the same material. My flips, however, do tend to be a bit frition-y with each other. The currency sleeves are 15 mil total thickness, while the coinflips are maybe 6. They are much thinner then the sleeves. So i dont know if the thickness makes them more rigid and less 'sticky', or if its just because of a different manufactuer. The flips i use are not tacky to the coins, but are held fairly securly within the flip.
The biggest concern i would have about flips or sleeves being 'sticky' is what would be causing that stickiness, and would it be harmfull to the item contained within. As mentioned, manufacurers are not very forthcoming with how their product is made, or even what its made of in a lot of instances. We may know more years down the road as more information is released... but for now - we all must base our decisions on whatever information is found!
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