It's a small, flexible cup made of medical-grade silicone. It is inserted in the vagina and instead of absorbing your flow, like a tampon or pad, it collects it. After a couple of hours, you throw the menstrual blood collected, wash and resuse the cup again. Thus, one menstrual cup can be used for up to 10 years. To know everything you need to know about a menstrual cup, watch these videos.