I found these at a car boot sale a few years back.
It’s a set of 6, metal trading cards made to celebrate the 30th anniversary of The Original Series in 1996 and produced by Paramount.
They are full colour and feature the 7 main characters. Sulu and Chekov appear on a card together, which seems odd. Why not just do a set of 7 cards?
Makes them out to be not as important as the others and therefore not good enough to have their own card. I’m sure that wasn’t the intention, but its how it comes across.
You can still find them on eBay in varying conditions and prices.