LNG-20 (Levonorgestrel) is a hormone-releasing IUD. The hormonal IUD is a small T-shaped piece of plastic, which contains levonorgestrel, a type of progestin. The cylinder of the device is coated with a membrane that regulates the release of the drug. Multiload 375 and Cu7 are copper releasing IUDs. Lippes loop is a double S-shape inert plastic, which is inserted in uterus to prevent pregnancy.