How Casino Dice Are Made: Materials and Precision Explained

Dice are among the oldest and most iconic tools in the world of casinos and gambling — in fact, they’ve become the poster child of the industry itself.

But way before land-based and the advent of an online casino, they were tossed (and blown on for luck) for thousands of years. Most people don’t realise just how much thought, engineering, and precision have gone into making them, especially the ones used in casinos.

Humble Beginnings of the Casino Dice

Back in Ancient Roman times, gambling might’ve been illegal, but dice games were still super popular. Roman dice, known as tesserae, were six-sided and numbered using pips — very similar to the dice we use today. They even followed the same numbering system where opposite sides always add up to seven. That design isn’t just a cool coincidence — it helps with symmetry and weight distribution.

That being said, Roman dice were often anything but balanced, and let’s face it, fair play isn’t exactly guaranteed when your die is a lopsided lump. As frustrations with unfair games grew over the centuries, gamblers across Europe started testing out better and more precise designs.

Around 1100 AD, people began making dice smaller and tried different numbering systems. But by 1450 AD, they had mostly returned to the classic six-sided format. More importantly, dice shapes became a lot more symmetrical, which was a big step toward fairness and truly random rolls.

Breaking the Mould

Today, dice manufacturing is a whole different world from the Romans’ uneven cubes. Thanks to the tech, dice are now made with extreme accuracy using a process called plastic injection moulding. Basically, molten plastic (often acrylic or another thermoplastic) is injected into two-piece moulds, forming the shape of each die within a plastic “tree” called a sprue.

The Most Popular Choice

Acrylic is a popular choice because it becomes soft when heated and hardens into a durable, solid plastic when cooled. To add colour, manufacturers mix pigments into the plastic before moulding. When the dice pop out of the mould, they already have indented pips (or dots) on each face.

But before they can be painted, the dice need to be smoothed. First, they’re tossed into giant tumblers  (similar to rock polishers) to remove any rough edges and surface imperfections. This gives them that nice smooth feel.

Final Touches

Next, the whole die is painted. Then, the dice go through another tumbling phase — this time to wipe paint off everything except the indented pips. The whole process can take up to four days, depending on how premium the final product has to be. Once they’re done, the dice are glossy, smooth, and ready for action.

Casino Dice Can’t Afford to Be Defective

But we’re not talking about the dice that come with your Monopoly box — casino dice are a completely different beast. Known as “precision dice,” they’re made to ridiculously strict standards because of how high the stakes are in land-based casinos.

Take craps, for example — each die must meet a tolerance of 1/200th of an inch. Yep, it’s that precise. Why? Because even the tiniest imbalance could affect the outcome. To avoid that, instead of moulding pips into the plastic, casino dice have drilled pips that are then filled with colored epoxy that matches the weight and density of the rest of the die. That way, every side stays perfectly balanced.

It might sound over-the-top, but each casino die also comes with its own unique serial number. They’re finely sanded, razor-edged, and polished to be completely clear, so no sore losers can claim they’ve been cheated (and this includes the house!)