The 1990 Leaf set was the first premium set introduced by Donruss and represents one of the more significant products issued in the 1990's. The cards were issued in 15-card foil wrapped packs and were not available in factory sets. Each pack also contained one three-piece puzzle panel of a 63-piece Yogi Berra "Donruss Hall of Fame Diamond King" puzzle. This set, which was produced on high quality paper stock, was issued in two separate series of 264 standard-size cards each. The second series was issued approximately six weeks after the release of the first series. The cards feature full-color photos on both the front and back. Rookie Cards in the set include David Justice, John Olerud, Sammy Sosa, Frank Thomas and Larry Walker.