These dice are made of metal, which is noticeable from their slightly heavier weight. A special feature of theirs is that the sides glow in the dark. Try it: Turn off the lights and the dice will light up! The Adventure Role Sets consist of 7 different dice: D6, D4, 2x D10 (steps of 1 and steps of 10), D8, D20, and D12. They come packaged in durable cases with expandable shelves, so you can easily carry them and play wherever you want. Compatible with Ultimate Guard®: The shelves that the dice come packaged in fit perfectly into the Ultimate Guard® Twin Flip'n'Tray 160.