What is an IUD? Expand An intrauterine contraceptive device (IUD) is one of the long acting reversible contraceptive methods (LARCs). It is a small device which is fitted inside the uterus, where it can remain for lengthy periods to prevent pregnancy. Copper IUDs are made of plastic and copper. There are 2 types of copper IUDs currently available in Australia. Once inserted, they are not felt by the woman or her partner. All IUDs available in Australia have fine nylon threads attached to the lower end of them so that when fitted, the threads extend through the cervix (neck of the womb) into the upper vagina. These threads allow the woman to check that the IUD is still in place and allow for easy removal by a doctor.