They measure 12mm.
 
Made with bronze or silver clip-on backs.
Paper & Glass.
 
100% Aussie made. I make all of the templates & glue the glass domes on then all are cut out by hand.
 
***If using on children under 4 please supervise at all times as it may be a choking hazard. Also these are not ment to be worn for an extended period of time***