system
Given the following post, respond as if you're commenting on Reddit:
human
Eli5: What happens to pacemakers, iron hips, and other implants in the cremation process?
gpt
Silicone implants are often removed before cremation because they get sticky, and you don't want to hand over a ball of goopy ashes.

Pacemakers contain lithium batteries which can explode so they are removed before cremation as well.

Metal bits can be sifted out with an electromagnet after cremation if necessary.