The basic concept is that the jewelry piece which holds the die is itself held together by small flexible O-rings. These O-rings are strong enough to hold the die firmly in place while also allowing the die to be swapped out. Not only does this save the die from ruin, it also allows the owner to significantly change the appearance of the jewelry whenever the mood suits them. Each jewelry piece is usually specific to one shape and the angle tolerances are so narrow that only our dice work for this jewelry. However, some pieces can be used for more than one shape and these are noted by their picture. Each dice holder comes with a random colored die. The color of the die may not be the same one that is pictured.