I pulled a sealed pack of 1988 Topps Big from a recent repack. Topps Big had a 3-year run from 1988-1990. I don't ever remember seeing them for sale. Did you collect these when they were new? Ten years or so ago I bought a box of the 1990 product, so I have quite a lot of those. I only had 4 of the 1988 set, all of which (three are Phillies, the other an Astro) acquired via trade.
Being called Topps Big you may suspect that they are bigger than 'normal' sized cards. They are about 1/4" longer on each edge. That means they won't fit in a penny sleeve and are usually too wide for a 9-pocket page.
The cards in this pack have not fared well even the pack was unopened. The cards are glossy on the front, but now the gloss is a bit tacky. And the cards have yellowed. The pack was unopened but not exactly air tight. I used some Photoshop magic to clean up the images. Here's what this card looked like right from the scanner.