About 24mm cube. Size to your liking in your favorite slicer. 

Printed at .1 and they print very well. I sanded them with 600 then 800 then 1000. Place wet sandpaper on a flat surface and rub the sides of the dice against it. For the rounded areas, place a folded paper towel under the sand paper to some cushion. 

Pips are painted in with finger nail polish (lacquer, not quick dry). Printed in PLA but would be interesting to print with resin.