I purchased this nipple from the Okeitani-shiki Chokusetsu Jyonyu Kunren-yo (Okeitani Method Direct Breastfeeding Training) Breast Milk Consultation Room in November 2024 and used it for about a month. It has been sterilized in a microwave, but please understand that this is a used item and has been stored by a private individual. Please only purchase if you are comfortable with this. Due to size constraints, the nipple will be compressed at the top as shown in the second photo for shipping.