1990 Fleer Update is a 132-card post-season "Traded" set -- the seventh consecutive year Fleer issued an end of season Update set. Fleer Update was issued exclusively as a boxed set through Hobby dealers. The set is listed alphabetically by team for each league and then alphabetically within each team. The fronts are styled the same as the 1990 Fleerregular issue set. The backs are numbered with the prefix "U" for Update.
The set does contain a Frank Thomas and a John Olerud rookie card.