These cards were given away to fans during select autograph days with a player. The players, in this case Lucas May, would sign them for the fans. They are large in size, 5x8, and resemble the vintage 1965 Topps Baseball card design. The best part about them are the little cartoons on the back.
Stay tuned, Kris sent along the first 6 cards of the set, so I'll feature each one individually on a future post. Also, two autograph sessions remain in Albuquerque (including one this coming Sunday) so, if you are in the area be sure to check them out. Here is their website. Again, thank you very much Kris.