Developed exclusively for 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 Personal Fit breast shields (sold separately). Made without BPA. Wash and sanitize all parts before first use. Refer to the instructions for use for complete cleaning and sanitizing instructions. Authentic Medela Spare Parts are made with the quality materials and workmanship you expect and trust, only from Medela.