These cards were signed in person at Monster Mania 50, which took place Aug 12th - 14th in Cherry Hill, NJ. They are signed on card by the celebrity on the front, and by the artist on the back. Each card is foil stamped on the back /100 and has a hologram show they are officially verified authentic by me. If you buy a pair Skeet and Matthew autos on the same order, you will get matching numbers.