Grizzoola... take any loose dice, no matter if they match or size and use a magic marker. At random write numbers 1 through 6. They will remain random. The dice that are biased were intentionally made BIASED by those wanting to cheat at a 'private Craps Game'. Many are led to believe these truly biased dice look and act the same as those in the Casino. It is superstition and folklore. They had catalogs with various dice combinations for various outcomes. Most in the late 1920's and 1930's. They were expensive, as well relative to pay at the time. They were called Novelty Dice. Anyone who read John Scarne's book know more about dice than most Craps Players. If anyone wants to learn about dice and bias... it will not be from a Dice Influencing website. THEY are... biased. No shit. Much like those selling burglar alarms... Crime in YOUR area is rampant... type of sales. The truly Biased Dice I owned were found at an antique shop in St. Joseph, Missouri in the early 1980's. A small wooden box with some broken to see the lead poured into the die for the bias... and others that if a metal detector was passed over it would... Bzzzzz. I was selling broken and complete ones at $20 each. Too bad I was not more interested in dice at the time. It is unfortunate many who believe some of these tall tales were taught by experienced 'Dice Handlers'. Much like how great 'Time Shares in Costa Rica' are today kind of sales. They are very good at what they preach. You are correct. It will not make any difference, but will ruin a perfectly good pair of dice. Another point. The Dice Cup at the Craps Table holds FIVE dice. When they mix them up, the superstitious toss them around a bit and pick a pair that they like what is face up. For the PRO Bias crowd... how do you determine which two were biased earlier? No way, No how. I gave a local Craps Player a pair of unspotted dice and a pair of cubes that were drilled for pips but a pip may have been off so not used. I said to magic marker them and see how they seem to work out. ZZZZZZZzzzzz Not a word. They do not give a flying shit. It does not fit the... agenda.