This set contains the essentials needed to complement your breast pumping experience, including extra breast pump parts, breast milk bottles, cleaning accessories and breastfeeding information. Not compatible with Freestyle or Harmony 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. All Medela breast milk bottles and products that come in contact with breast milk are and always have been made without BPA.