This gaming box was designed with Transformers TCG in mind, but also works great for Pokemon, KeyForge, Magic: The Gathering, and many other games. It features a secure, latching lid with beveled insets that keep cards in their cells. Each cell holds 60, single-sleeved cards. Two cells can be combined by removing the divider between them to open up space for oversized cards (in 3.5 x 5 Toploaders too). The dice tray is removable and you can store one of the cell dividers beneath it. The Prime X4 also has a long slot that is great for tokens, pencils and pens, or poker chips.