Cybertron trading cards

I know very little of these Cybertron trading cards, other than they were packaged 7 cards per pack and I received several packs years ago with an order from RobotKingdom.com. The cards are smaller in size than your traditional trading card. I rather like them and would like to piece together the whole set, but I've haven't been able to find any in a very long time. Do you have any background info on these? If you do, please let me know!