What is an IUD made of?

An IUD, or intrauterine device, is a form of long-term contraceptive that is most commonly made of plastic and copper. The plastic provides a flexible structure that allows the device to fit comfortably within the uterus, while the copper components play a crucial role in its effectiveness as a contraceptive. Copper ions released from the device create a toxic environment for sperm, preventing fertilization and possibly impacting implantation.

The materials used in IUDs are specifically chosen to ensure durability, biocompatibility, and effectiveness in preventing pregnancy. Other materials listed in the options either do not have the appropriate properties for use within the human body or do not contribute to the contraceptive function the way plastic and copper do.