They are the Stacker II pills. I recently bought some at a gas station, and have them here in front of me. The are labeled the same way. Blackjax with AJ over 3850. I've only taken one, but its a bit more than a caffeine pill, theres some other herbal supplements in there, I'm not exactly sure the effects, that's what I was trying to find out when I found this page. I found the same thing you did, lots of music, etc listings, nothing of interest.