The Moon Cup Menstrual Cup provides you with the same benefits as The Keeper, but is made of soft, non-latex, medical grade silicone. Introduced in 2006, The Moon Cup is innovative, economical, comfortable, and environment-friendly. This soft, silicone menstrual cup collects the flow rather than absorbing it, so the vaginal tissues aren't dried out as they can be with disposable tampons. The Moon Cup is recommended for those with latex sensitivities. The Moon Cup can last up to ten years. Size B is for women who have not delivered a baby vaginally CANADIAN customers please note: due to Health Canada regulations The Moon Cup cannot be shipped to Canada.