The vCup by Yonitox is made with 100% Medical Grade Silicone. It works by collecting the menstrual blood vs. absorbing it like a tampon. You can wear the cup for up to 12 hours a day. The cup is safe for overnight use and sexual intercourse. The vCup is flexible, comfortable, and resusable. vCup is made is three size to support light, regular, and heavy period flows. How to use instructions are provided with the vCup and listed in product photos.