Like menstrual cups, menstrual discs collect your period blood. Unlike menstrual cups, menstrual discs are held in place by being tucked behind the pubic bone rather than by suction - meaning they are a great option if you have an IUD. Check out our comparison video, here. Capacity - The Hello Disc will hold up to 50 ml (our L cups hold 29.5 ml). That’s equal to around 5 regular tampons or pads. Material - Hello Cups are made from medical-grade TPE, Hello Discs are made from medical-grade silicone. Position - Menstrual cups sit lower in the vaginal canal. The Hello Disc tucks behind the pubic bone. Suction - Hello Cups suction when in position. The Hello Disc does not use suction - instead, it sits in place. (This makes the Hello Disc a great choice if you have an IUD!) Sizes/Cervix heights - Hello Cups come in 3 cervix heights and 3 different sizes. The Hello Disc is great for all cervix heights (just adjust the tab as you need to) and comes in a handy ‘one size fits most’.