A friend and I had some manufactured, 20 years ago. We thought about selling them, but had no idea how much interest there would be. My friend did the math to

A friend and I had some manufactured, 20 years ago. We thought about selling them, but had no idea how much interest there would be. My friend did the math to come up with 6-sided ones that had the most uneven odds we could find, and each dice summed to the same number, and all the numbers 1-24 were each used once, and the numbers 1, 2, 3, and 4 were each on a different die, making them easy to identify. We colored them red, green, blue, and then maybe yellow?, if I remember correctly, to also try to make them easy to identify. If I remember correctly, 1 and 3 were fair, and 2 and 4 were fair, which we thought was also neat, because it would help you "prove" that the dice were fair, heh.