1.Medical grade silicone copa menstrual, 0 side effects, use 12 hours long. 2.Not sliding sideways, no smell. 3.No foreign body sensation,recyclable reuse 10 years. 4.Menstrual cups should be sterilized before use, please use the dedicated sterilizer disinfection, or boiling water disinfection. Matters needing attention : Women who has no sexual experience are not recommended to use this product. No allergic reactions Does not lead to mold and urinary tract infections,can be apply to all women, but virgin use it careful. How to choose proper size? Size S:  for women who have not given birth to a child or women up to the age of 25 years old Size L:  for women who have given birth to a child or who are over 25 years old Why choose menstrual cup ? High-quality medical grade silicone that is widely applied in medical care products such as infant nipples , catheters etc. Since it is toxic free, safe to use and liberalize you from. It can make blood completely cut off from the air,eliminate bacteria occur through the air, to prevent bad breath, itchy skin allergy and prevent disease of department of gynaecology , let you experience the dry and pure and fresh unprecedented.