If you can’t tell that is the female reproductive system. I used different colors to distinguish between the myometrium and the uterus. The beige section inside the uterus is representative of the increased mucous that is built up by a hormonal IUD. The beads are representative of the copper ions that are released by the copper IUD. The IUD in the uterus is modeled after a hormonal IUD as you may be able to guess since it isn’t copper.