The EXPLORE KIT comes with both FUN CUP sizes, SIZE A, and larger menstrual cup, SIZE B, so you can see which one is the ideal fit for you or maybe you like using both. (Many customers like being able to alternate depending on how heavy their flow is that day or how sensitive they’re feeling.) Both cups are designed with a firm rim for secure placement and a firm tip for adjustment, with soft, flexible silicone in the middle. SIZE B is the softer of the two, giving you the size you need for a heavy flow day without feeling intrusive. • SIZE A: 2.1 in, Ø 1.56 in, 0.68 oz (5,3 cm; Ø 4 cm; 20 ml) (holds 4x as much as a tampon) • SIZE B: 2.29 in, Ø 1.7 in, 1.01 oz (5,8 cm; Ø 4,3 cm, 30 ml) (holds 6x as much as a tampon)