How much are Michael Jordan Rare Air- Promo cards worth? (set of 4)?

I have a set of 4, Rare Air Promo cards. They are in a nice hard plastic covering. It says that they are 1, of 10,000 made. The last year of statistics on the cards are the 1992-1993 season. On the front they have a gold holographic background, and his picture, and it says Michael Jordan Rare Air. Can anyone tell me what these are worth?