This is a small rubber device similar to a diaphragm. It can be used without any spermicidal cream or jelly because it fits very tightly over the cervix preventing the sperm from swimming to the egg. This tight fit might be bad for the cervix and might increase the problems with Pap smears. It is not widely used but is a good method for some women. It may be hard to find a doctor or clinic who can fit you with one.