Chinese divination moon blocks

A few years ago, I ended up with a qiantong cup and found out today from a co-worker that my use of this temple artifact was indeed wrong. Before I shake the cup to get a numbered stick (which would be associated to my fortune), I need to first throw these pair of crescent moon shaped 'dice' which allow the gods to tell me whether or not they'll even hear my prayers today. In Taiwanese, they're called 'bwah-bwei' and in Mandarin, the characters are 'jiao bei'.

Anyways, I designed one, print