I am not sure of the exact size. I will go somewhere and check for you; however it does have the stretch band in the back and fitsboth my 12 yearold and I.
I will have to check, but it is the same size as all the other rings you would by from from like clairs. It fits my 12 year old daughter and myself. It is the kind of band that stretches, but I will go by some where and check for you.