(A) Non-medicated IUDs : These are intrauterine devices that do not release any copper or hormones. An example of this is the Lippes loop (III). (B) Copper releasing IUDs : These IUDs gradually release copper, which has a spermicidal effect. Multiload 375 (I) is an example of this type of IUD. (C) Hormone releasing IUDs : These IUDs release hormones to prevent pregnancy. LNG-20, also known as Mirena, (IV) is an example of this type of IUD. (D) Vaults : This is another name for cervical caps, a type of barrier contraceptive method made of rubber (II).