With the exception of the 1 die labeled Loaded all my dice have been designed to roll fair. By that I mean: 1) Have a center of gravity within 10um of the dies center(often within 0.1um) 2) All faces have an equally sized area to land on if landing on a flat surface 3) Dice are numbered so oposit sides add to 1 more then the number of sides. 4) All numbers between 1 and the number of sides are used only once. This desire to make fair has even been extended to my two 4 dimensional dice though rule 1 is only accurate on the 3d model and not the 4d object it represents. To do this I have had to jump through some hoops with some of my designs.(for example adding pegs to the missing cubes corners in my inverted die design. I have no intention to change my practice of always making fair unless purposely making loaded, but I wondered what other designers believe that it is important to follow these 4 rules and also weather or not the collectors out there care.