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. The turquoise color gives it a clean look. It is recommended that you start with a small size and gradually increase the size. This no.3 is about 20-22mm in diameter, root 24mm/insertion length 100mm. Please refer to the photo that compares it to an AA battery. Each one is delivered in antibacterial packaging.