The Spectra Double Collection kit is BPA/DEHP free and includes everything you need to single or double pump with the Spectra 9 Plus, Spectra M1, Spectra S2, Spectra S2 Plus, Spectra S1 and Spectra S1 Plus as well as the S3PRO and Synergy Gold models. To assure quality, these replacement parts are genuine Spectra brand replacement parts. Contains all the Spectra accessories to attach to your breast pump for double pumping. Spectra collection kit in choice of 20mm 24mm or 28mm flange size. Includes bottles with ivory caps, collars and sealing discs.