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Diaphragms and caps are barrier methods of contraception. They fit inside your vagina and cover your cervix (entrance to the uterus – womb).
They come in different shapes and sizes. Vaginal diaphragms are circular domes made of thin, soft latex (rubber) or silicone with a flexible rim. Cervical caps are smaller and are made of latex or silicone.
To be effective, diaphragms and caps should be used with a spermicide. Spermicides are chemicals that kill sperm.