Also known as the American wheel. One has a single zero, while the other consists of two zeros. The number sequence laying upon the circumference of the double zero wheel are positioned with mathematical diligence. So while they seem to be randomely distributed, they’re not. The irony in this fact is that the numbers are strategically displaced so that the outcome can be random.
Red, black and green are the color coordinations on a double zero wheel. Go to a casino one of these days and play both forms of roulette; the American version, and the European version. You’ll find the American style is far easier. But don’t take my word for it.