Inkredible is an insert set in 1999 Upper Deck Retro. This 29-card set features on card autographs of current major league stars, prospects, and stars of the past (including several Hall of Famers). The cards were inserted 1:24 packs (or one per lunchbox). Two players Sean Casey and Eddie Murray did not return their cards in time and were packed as redemption cards that expired in April 2000. Both cards are known to exist and can be found on the secondary market. The set was paralleled by a Level 2 set. Each card in the set was serial numbered by hand to the player's jersey number.