The paper describing these dies might help then:

http://www2.oberlin.edu/math/faculty/bosch/nbd.pdf Bosch, Robert; Fathauer, Robert, Segerman, Henry - Numerically Balanced Dice (2016)

(btw., here's the about page for The Die Lab: https://www.mathartfun.com/thedicelab.com/DiceDesign.html)

More various stuff on fair dice:

On fair but irregular plyhedral dice:

http://statweb.stanford.edu/~cgates/PERSI/papers/fairdice.pd... Diaconis, Persi; Keller, Joseph B. - Fair Dice (1989)

https://mathoverflow.net/questions/46684/fair-but-irregular-...

https://pp.bme.hu/ar/article/download/7607/6570/ - Várkonyi, Péter L. - The Secret of Gambling with Irregular Dice: Estimating the Face Statistics of Polyhedra (2014)

https://web.archive.org/web/20110925191300/http://blog.eqnet...

Note: The link to http://maths.dur.ac.uk:80/~dma0cvj/mathphys/supplements/supp... in the comments there is broken and the archived version doesn't have the images, but the PDF copy survives in the archive. (One can find the other PDFs from that page here, by filtering: https://web.archive.org/web/*/http://www.maths.dur.ac.uk/~dm...)

"Polyisohedral" dices: * http://loki3.com/poly/polyisohedra.html * http://loki3.com/poly/fair-dice.html

http://www.mathpuzzle.com/MAA/37-Fair%20Dice/mathgames_05_16...

https://web.archive.org/web/20050602020925/http://www.geocit...

https://savevsdragon.blogspot.com/2011/11/brief-history-of-p...

https://journals.aps.org/pre/abstract/10.1103/PhysRevE.78.03... How random is dice tossing?