The High Cheese Baseball Walk Off Mystery Pack includes 2 baseball trading cards, with 1 card being PSA graded and 1 card featuring an autograph. Manufactured by High Cheese Baseball, these cards are made of paper and measure 4 inches by 7 inches. The product is recommended for ages 3 years and up and has an authenticity guarantee by PSA. The pack is themed around baseball, sports, and autographs, making it a perfect choice for collectors and fans alike.