These are dice holders, made to take 12mm 6 sided dice.  

They are made of resin and will be supplied unpainted. The single holders are 30mm in diameter and the double holders are 40mm.
Slight trimming and filling may be required as bubbles and flash may form as part of the casting process, though care will be taken to send you the best possible piece. It will not require washing prior to undercoating.

The dice are not included, and are only shown for illustrative purposes.