A menstrual cup is a reusable, bell-shaped device that is worn internally to collect menstrual blood. It is made from medical grade silicone and can be used as an alternative to disposable pads or tampons during menstruation. Menstrual cups are designed to be worn for up to 12 hours at a time, after which they are emptied, rinsed, and reinserted. They are eco-friendly since they do not produce waste like disposable pads or tampons, and can last for several years with proper care.