Beginning in 84 through 91 Topps issues oh Gallery of Champions in sets of 12 in silver, bronze and aluminum. They were miniatures of cards in the base set for those year. One pewter piece was also included for high volume sellers of Traded set that year.
During those years they also produced regular card size bronze premiums of the rookie cards of players like Mantle, J Robinson, Snider and others
In the 90s Topps started putting out cards in
Porcelain form with rounded corners and numbered. One year they apparently produced a whole set that way. A poster Da Cldye has a thread on them.
They also did a full run of Mantle cards in that format. I ended up with the 59. They did the same for other stars, including Ryan
There is one on eBay now but not sure I can get link to work
https://www.ebay.com/itm/356347923682
https://www.ebay.com/itm/356347923682