Why did I not get these sooner?
I lost my original roller-key a long time ago and just forgot about it.  Then I found these?  They work wonderfully when you're trying to squeeze that last little bit of paste or ointment out of the tube. (I love to save $$$.)  However, they are a bit tricker to work when the tube is made of a plastic and not metal.  Many toothpaste tubes are now made of a soft plastic.  The key will still work, but it is more difficult to keep the tube rolled.  The key works just fine...it's the darn tube that is the problem!
Rating: 4 stars