ÂThese Boxes are constructed of white corrugated paper and have a 200 lb. test strength. Use this box for storing and protecting collectible trading cards like: baseball cards, basketball cards, football cards, Magic The Gathering, VS, Yu- Gi- Oh, Pokemon, Dragonball Z and others. Holds Approximately 400 Magic The Gathering cards in sleeves.(please note that the thickness of your sleeves may have an impact on the amount of cards that the box can hold)