I've only looked at two. A narrow one wide. One of the four wide elements (clamshells) has 2 holes. I didn't go back and stretched the rest to see if they were ok. I will contact Amazon about this. I just tested these two on floss. I didn't do anything else that would create a pinhole. The holes will probably grow. The thickness of the product is too thick for dental floss. You can't control the thread very well. So you need to stretch the items you carry on your thumb and forefinger. At this point you might want to use nitrile gloves instead of buying those cribs. When I tried to stretch, they caused slight pain. I think you'll find the thickness is too much when you need to have good control over the things you touch.
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