Discover the ultimate solution for card storage! These storage boxes are designed with a large inner diameter of 7 x 3.7 x 2.83 inches (17.8 x 9.4 x 7.2 cm), offering ample space to hold 400 standard 20PT trading cards or 500 collectible game cards. Made of high - quality cardboard, they're sturdy, thick, and reusable. Assembly is quick and easy; just follow the creases. They're not only practical for storing various types of cards like sports cards, board game cards, and postcards but also customizable. You can paint, write, or paste stickers on them to create your own unique storage boxes. This not only helps you organize your cards efficiently but also adds a fun element to your card - collecting hobby, bringing more convenience and enjoyment to your life.