The National Geographic Rock and Mineral Playing Card Set comes with a standard 52 card deck and over 75 genuine gemstones. You can play all your favorite card games, and each card has a gemstone, rock, or mineral fact on it, making them great for trivia and memory games too. Magic in the details 52 card deck allows you to play all standard card games Each card has a gemstone, mineral, or rock on it as well as a trivia fact about each specimen This kit includes more than 75 genuine gemstones, so you can see many of the specimens on your cards in real life A gemstone storage bag is included Instructions for memory and trivia games are included The bare necessities Paper / rocks / minerals / stones 7 1/4'' x 2 1/8'' x 10'' Bag of gemstones: 0.44 lbs