I spent years making a die that would be as small as a normal gaming die. It was hard work. But at a Magic Circle dealers' day, a German magician asked me whether I could make one larger, since apparently that's how they like them in Germany.
Well, the customer is king (Der Kunde ist der König), so I have now made some that are 20mm cubed. Now I've made them I quite like them - they have a nice chunky physicality that would work well for larger audiences.
They are only available in white and black and they are wirelessly charged. They are the same price - £350 - as the regular sized ones