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<p>[QUOTE=&quot;desertgem, post: 7761986, member: 15199&quot;]Saflips, Guardhouse coretex, and others are made from stretched Mylar( BoPET) for strength and high visibility. They do vary in thickness which affects those 2 characteristics. Most Coin grading companies use similar makeup. Thickness can become a problem for flexibility and tearing after a period of time or high temperature situations. If you have to move a coin into and out of the flip, the low flexibility ones can cause marks, if roughly handled, on the coins, especially softer metals.&nbsp; If one is shipping coins sometimes a seller will put it into a PVC flip with a label &quot;Do not store in this soft protective PVC flip, discard and replace with a&nbsp; FLIP of your choosing.&quot;&nbsp; IMO, Jim[/QUOTE]</p><p><br /></p>

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