These cards were signed in person at Monster Mania 51, which took place Sept 30th- Oct 2nd in Hunt Valley, MD. 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.