<unk>  Several brands of<unk> s were manufactured during the late 20th and early 21st centuries. They can be divided into two types: cavity rim<unk> s, and other<unk> s. Cavity rim<unk> s adhere to the cervix, while other<unk> s adhere to the vaginal walls around the cervix. However, the FemCap (the only<unk>  sold in the United States after 2008) adheres to both. The cavity rim<unk> s are Prentif, made of latex, and the disposable<unk>  Oves, made of silicone. There are four sizes of Prentif: 22, 25, 28, and 31 mm. There are three sizes of Oves: 26, 28, and 30 mm. Unique among<unk> s, it adheres to the cervix by surface tension, rather than by suction. The other devices are the latex Dumas and Vimule, and the silicone FemCap, Lea's Shield, and Shanghai Lily. There are five sizes of Dumas: 50, 55, 60, 65, and 75 mm. There are three sizes of Vimule: 42, 48, and 52 mm. There are three sizes of FemCap: 22, 26, and 30 mm. There are four sizes of Shanghai Lily: 54, 58, 62, and 66 mm. Lea's Shield is manufactured in a single size. Unlike the other<unk> s, Lea's Shield has a one-way air valve that helps it seal to the vaginal walls. The valve also allows the passage of<unk>  mucus. FemCap does not have such a valve and as such can be used to collect<unk>  mucus to support the Billings method. Both Lea's Shield and FemCap have loops to assist in removal. Shanghai Lily is only available in China. As of 2008, many of the other devices are no longer being manufactured: Prentif, Vimule, and Dumas have been discontinued. Prentif, Vimule, and Dumas: Oves is only being sold as a conception<unk> , not as a birth control device. As of February 2009, FemCap was the only brand of<unk>  available in the United States. FemCap is also available in the UK via the NHS on prescription and is often distributed free from Family Planning Clinics depending on the health authority. Lea's Shield is only available as the German brand LEA contraceptivum. FemCap As of 2009, FemCap is the only brand available in the United States. A new FemCap performed poorly in a user acceptability study, suggesting that the modifications increased coital pain or discomfort among female users and their male sex partners, and that the modifications did not improve ease of use overall. However, FemCap users are still less likely to report such pain or discomfort than diaphragm users. Sponge covered<unk>  A<unk>  of the 1920'a had a sponge permanently attached to the outer surface of the<unk>  to hold a liquid spermaticide such as vinegar. It was not as easy to clean the<unk>  when removed, due to the sponge part. 2-part<unk>  This<unk>  of the 1920s (the "Mizpah") had a separate ring (rim) which went around the base of the cervix and was worn constantly. The<unk>  portion (which has its own ring/rim) is snapped into the base ring for use. A criticism of it was that due to the groove in the base ring (so it could attach itself to the<unk>  part) it could not be kept perfectly clean without removing it.
Cervical cap
Pinard horn
Breast shell
Clinic
Phrygian cap 
Tubex 
Glabella
Vaginal cuff