Juju Menstrual Cup model 3 is perfect if you have a high cervix. The Juju Cup model 3 has a longer than average body and stem to help with easier removal. Many people with a high cervix can successfully use shorter cups but for some their cup may sit higher in the vaginal canal and be more difficult to remove.
Juju Menstrual Cup model 4 has been designed for those with a low cervix. The Juju model 4 has a short body and a shorter stem to help with easier removal. The Juju model 4 has a higher than average capacity comparied to some other brands of short cups due to it's more bulbous shape