This 33-card set was distributed in 3-card packs found in boxes of Chewy Granola Bars.
The players featured were current All-Stars.
You could see the top card in the pack, so I wonder how many boxes were found opened in the store with the pack missing. The top players would have been Nolan Ryan and Cal Ripken.
There was also an offer card to use in sending away for a complete set, or for ordering Topps Baseball Stickers and Yearbook.