Nopra Cup Menstrual Cup (Green, Size S) Brand new, unused. Unopened. Please note that there may be some minor scratches on the packaging. Made of safe medical-grade silicone, it can be used for up to 8 hours. The amount of menstrual blood is 20ml for those with light flow and 40ml for those with heavy flow. In addition, commercially available sanitary napkins absorb about 5ml per piece, and tampons absorb about 6ml per piece, so you can feel secure even on heavy days with the Nopra Cup. Recommended for those who frequently need to change tampons or sanitary napkins.