They measure 15mm.
 
Made with bronze or silver clip-on backs.
Plastic. The backs are sealed with resin for added strength.
 
These are handmade, every piece has been cut out by hand and sealed in resin.
 
***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***