A diaphragm is a rubber cup, and a cervical cap is a smaller latex version of the diaphragm. You need to be fitted for this form of contraception. After applying spermicide to the rim of the cup or cap, the diaphragm or cervical cap is inserted by hand into the vagina and placed over the cervix. They are to be left in place for 6-8 hours after sexual contact. Using them consistently and correctly is necessary for these barrier methods to be most effective.

Effectiveness = 82% or higher when used correctly with spermicides.