The cards are also duplicates of the original, with the fronts and backs being identical, just increased in size.
The sets were not very big. There were just 30 cards in the 1984 version, and Billy Buck was the only Cub.
The set doubled in size in 1985, with 60 cards, and three of them were Cubs. You'll have to take my word that these are Super cards, since they are identical to the regular ones.
The 1986 set also featured 60 cards, but the Cubs lost one, down to just two.
The brand disappeared after 1986 and has not returned.