Copper IUDs, or intrauterine devices, are small, T-shaped contraceptive devices made of plastic and wrapped in copper. They are inserted into the uterus by a healthcare provider and can prevent pregnancy for up to 10 years. The copper creates an environment that is toxic to sperm, reducing the chances of fertilization. These devices are a form of long-acting reversible contraception, meaning they can be removed at any time if a woman decides to become pregnant. Copper IUDs do not contain hormones, making them a suitable option for those who prefer non-hormonal birth control methods.