1991 Ultra is Fleer’s foray into the premium brand market to compete with Upper Deck and Leaf. The complete base set consists of 400 cards in one series. The set is arranged alphabetically first by team then by player. Subsets include Major League Prospects (373-390), Great Performances (391-396) and Checklists (397-400). Also there is a ten-card insert set called “Ultra Team”. Collector’s terminology refers to the set as “Ultra Gold”.
The cards featured three full color photos on the back making it the first time a baseball card had 4 photos of one player on a card.