The name of this set is PS-206 Action and they were inserted into packs of 2001 Private Stock at a rate of 2 per pack. I have never seen these cards before because they appeared at a time when I was doing a lot more partying than collecting. These minis are glossy and the photography is pretty sharp. The backs are a little bland though, without any stats or write ups.
I love the fact that minis have made a big return in the modern day hobby and I hope they stay around for a long time (or until Topps figures out a way to make me loathe them).