This 12-card standard size set was in the 1990 Donruss set as a special card deliniating each 55-card section of the 1990 Factory Set. This set honors those players who connected for grand slam homers during the 1989 season. The cards are in the 1990 Donruss design and the back describes the grand slam homer hit by each player.
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| Title | MINT | NM-MT+ | NM-MT | NM | EX-MT | EX | VG-EX | VG | GOOD | POOR |
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| Title | GemMt | Mint | NmMt+ | NmMt | NrMt | ExMt | Ex | VgEx | Vg | Good | Poor |
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