John1 is correct, I was schooled on these a couple of years ago. It's actually a master trail die and if you pay attention to 85's, it will be hard to find one without some amount of it showing, some are just stronger.
Here is a link. http://www.traildies.com/master-dies-with-trails/
Here is a link. http://www.traildies.com/master-dies-with-trails/
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