Pump on the go with ease! Cara Cups work with any Spectra pump. Got them thinking I would pump on the go more often. Used twice. Cleaned and sterilized. Includes all parts. However- Spectra recommends replacing duckbills and diaphragms. 24mm flange size Also including car charger! Works with all Spectra pumps. Pet free and smoke feee home. Willing to split lot.