This single charm SNAP necklace comes with your choice of a chain (18”) or cord (20”) necklace and a custom cabochon SNAP button charm that is easily interchangeable!If at any time you wish to change out the image/artwork on your necklace with a cute updated image you took recently, then all you have to do is purchase a new charm, pop the old one out and snap the new one in...no need to buy a whole new necklace!