They are available in small and large sizes. If you feel no discomfort even if you put it in for more than 10 minutes, you can put on your underwear as it is and go about your daily life. The silicone is not as hard as plastic and has a gentle elasticity. There are five different sizes from no.1 to no.5. It is recommended that you start with a small size and gradually increase the size. This no.2 is about 19-20mm in diameter, root 21mm/insertion length 90mm.  Each product is delivered in an antibacterial package.