The 1990-91 Skybox Basketball Set 1-423 is a standard-sized sports trading card set featuring Michael Jordan from the Chicago Bulls. This original set manufactured by SkyBox in 1990 includes 423 cards, with two missing cards (380/383) (Wayne Rollins and Avery Johnson ).The trading cards are made of card stock and are part of the base set for the 1990-91 NBA season. Perfect for basketball fans and collectors interested in owning a piece of NBA history from one of the greatest players of all time.