This is a compound of a nearly regular D6 and of a sum-D6. As the sum-D6 that composes the shell gives results from 0 to 5, the core is numbered from 2 to 7.
As a consequence, when you roll this double die, you got the same results as summing the results of two regular D6. But in a very original way!
For instance, in the rendering, the upper face of the core show 3 pips and the upper part of the shell, around this face, shows 2 extra pips. Thus, the result is 3+1+1 that is 5.
SUCESSFULLY PRINTED in White Strong and Flexible.
Not printable in Metal, sorry (movable parts).
More information in this post.