Teaching cervical effacement and dilation is easy with these five models that represent the progression of effacement and dilation at 1 cm, 3 cm, 5 cm, 8 cm, and 10 cm. When used with our Fetal Model (Item #79814), which is not included and sold separately, the set of cervical models can also be used to demonstrate the position of the fetus as labor progresses. In addition to a cervical opening, each cervix model features an open-ended back, through which the Fetal Model can be placed to simulate the descent of the fetus. The Fetal Model's head also can be delivered through the 10-cm cervix model. Set comes with five cloth cervix models and instructions.