Good question. I do not have a scale yet. My rough estimate on measure & weight would be 13-15mm and 2.5 grams.
The portrait on the right looks Flavian to me. But seriously - that is a ROUGH coin. Try to get ones that you can actually ID!
It just came in a cheap lot I was not expecting much of. I just wanted to hold a palmful of ancients without spending a lot and without damaging nicer coins. I just wanted to know if there was a way to identify such a coin as presented, not if it was pretty.