You need a bit of back story to get what this threads about. Crosman used to make boxes of certain pellets with a count of 1250 pellets in each. No fancy packaging, just a plain brown cardboard box. But they would put a stamp on the box which said which die the pellets came from. So when some guys would find a particular Die # that their airgun liked they would stock up it. I guess it was a thing a while back - I guess if you had a Die # that shot really well you had a select pellet for no more cost than the tins.