In 1991, Barbie introduced a new line of collectible trading cards that featured various images of Barbie dolls, fashion, and scenes from her world. These cards were produced by Impel Marketing and were aimed at young collectors and Barbie enthusiasts. The cards typically featured colorful artwork and images showcasing Barbie in different outfits, settings, and poses.

One notable aspect of the Barbie cards from 1991 was that they were part of the larger trend of collectible trading cards that gained popularity during that time. Many different franchises and characters had their own trading card sets, and Barbie was no exception.

If there's a specific "first" related to Barbie cards in 1991 that you have in mind, please provide more context or information, and I'd be happy to help you further!

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All cards come in penny sleeve
Cards were scanned in sleeves 
All cards are mint/new condition, no issues. Stored in temperature controlled environment since 1991. 
Unless otherwise described, all cards are LN/M condition.