Developed exclusively for Medela Sonata, the Spare Parts Kit includes the extra or replacement pieces you need to use your Sonata Breast Pump. Ergonomically designed for comfort while holding your breast pump kit. Always have clean parts on-hand when you need them most. Compatible with all Medela PersonalFit breast shields (sold separately). Made without BPA. Wash and sanitize all parts before first use. Authentic Medela Spare Parts are made with the quality materials and workmanship you expect and trust, only from Medela.