Hormonal coil (IUS)
Levosert is made of a small white T-shaped frame made from a plastic called polyethylene. The hormone is contained within a silicone substance called polydimethylsiloxane. This is surrounded by a membrane (skin) also made of polydimethylsiloxane. There are two fine threads, made of polypropylene and copper phtalocyanine blue, attached to the bottom of the frame
The Hormonal coil is a small, T-shaped plastic device that is inserted into your womb by a doctor or nurse. It releases the hormone progestogen gradually into your womb which prevents pregnancy by making the fluid in your cervix thicker (which makes it more difficult for sperm to enter the womb), and preventing the lining of your womb thickening enough for an embryo to grow in it. Sometimes it can also stop you ovulating.