I had a long chat with Lou Zocchi after that article about my collection appeared last year. Lou said that the d7 he used to sell is not, after all, fair; certainly not as fair as the d5.Kevin Cook said:I cant speak for the d7 as I dont know the designer ... but I know it does roll fair
Fairness, though, is a scale. As an absolute state for dice, it only exists in theory. If we take as our standard of "fair" so-called shop dice, the plastic d7 is unfair but the d5 is.
Of course, all this assumes a "fair" throw. In theory, an unfair die with an unfair throw results in a fair outcome if the two kinds of unfairness exactly counter each other. In theory anyway...
(Alexander @ The Dice Maniacs' Club)