The Medela Symphony Double Pumping System, to be used with the Medela Symphony Breastpump, supports all your breastpumping needs - whether pumping to establish and maintain your milk supply or for just a weekend away from your baby. Contains PersonalFit Breastshields, collection containers, valves with membranes, lids, tubing, membrane caps, protective membranes, and Breastfeeding Information Guide. What's Included: Kit includes everything you need to double or single pump with the Medela Symphony hospital-grade breastpump 2 - 24 mm PersonalFit breastshields 2 - PersonalFit breastshield connectors 2 - 150 mL (5 oz) breastmilk bottles with lids 2 - tubes 2 - valves 4 - membranes 2 - membrane caps 2 - protective membranes Supports the Symphony Breastpump (sold separately)