The 2026 Bo Jackson Battle Arena Release Day Promo The Kid Promo featuring Bo Jackson is a highly sought-after sports trading card. This limited edition card, signed by Bo Jackson with a hard signed autograph, is made of durable 20 Pt. card stock. With a standard size and English language text, this original baseball trading card showcases Bo Jackson and Ken Griffey Jr from the Seattle Mariners, making it a valuable collectible for fans and collectors alike.