What is Silky Cup (reusable menstrual cup) made of?

It is made of medical grade soft and flexible thermoplastic elastomer (TPE) which has passed mucosal irritation tests. There is no risk of infections or vaginitis. TPE is smooth and therefore causes no problems like rash or irritation. They are free from perfumes, latex, silicone, PVC, Phthalates, proteins, BPAs, dioxins, pesticides, or carcinogens, and bleaches.