Menstrual cup is a bell shaped container made of soft rubber or silicone that is used to collect menstrual fluid. A menstrual cup is used by inserting it into the vagina and leaving it there. If properly inserted, the rim of the cup forms a seal with the walls of the vagina to prevent leakage. Menstrual cup should be changed after every 12 hours. To pull it out of the vagina, the stem at the base of the cup needs to be held tightly between the thumb and the index finger and pulled out. After disposing off the menstrual fluid, the cup can be rinsed with water and reused. Once your period is over, the cup can be reused for the next cycle after cleaning the cup with boiled water and drying it.

Illustration of menstrual cup, menstrual cup worn in the vagina, step 1: folding the menstrual cup, step 2: inserting the folded menstrual cup - Menstrupedia