The 1991 NetPro Tour Star Tennis 99 Card set includes cards featuring top tennis players such as Agassi, Sampras, and McEnroe, all in their prime. This original set manufactured by Protennis Player Cards Inc. in the United States offers vintage collectors the opportunity to own many rookie cards from the ATP Tour season of 1991. The cards are made of card stock and come in a protective case, making it a valuable addition to any sports trading card collection for tennis enthusiasts looking to reminisce about the golden era of tennis.