This item was purchased when renting the "Symphony Electric Breast Pump" for hospitals. The breast shield is 24mm. Purchased around October 2023 and used for about a month. Please understand that this is a used item and accept it as-is, with no returns. It will be shipped in the original box. *Due to having a young child, I may be slow to respond to messages. Thank you for your understanding. Thank you for your interest.