Used for about a month. It easily attracts fingerprints, so it might be best to clean and disinfect it before use. As you can see in the third photo, there is a slight gap in the case. Medela Nipple Shields Contact Nipple Shield M size 20mm Protects nipples during breastfeeding, supports the baby's latch, and gently supports breastfeeding. Medela's thin nipple shield "Contact Nipple Shield" Can be used temporarily when nipples are painful or cracked, or when the baby cannot latch properly. Made of thin, soft silicone, it is placed over the nipple before breastfeeding to protect it. There is a hole at the tip, allowing the baby to drink breast milk from it. Use it in these situations: ・When nipples are stinging, have wounds, or are painful. ・In cases of flat or inverted nipples. ・When the baby has trouble latching onto the nipple or cannot drink breast milk properly.