Extra set of Breast Shield connectors for use with Medela breast pumps. Not for use with the freestyle swing harmony or single deluxe breast pumps. Authentic Medela spare parts are engineered tested and approved to work specifically with your Medela breast pump. Non Medela spare parts can vary significantly in design materials and workmanship all of which may affect the performance of your Medela breast pump. Made without BPA safe for mom and baby. All Medela breast milk bottles and products that come in contact with breast milk are and always have been made without BPA.