The Spectra Single Collection kit is BPA/DEHP free and includes parts for the Spectra SG Synergy Gold Breast Pump. This kit contains Spectra standard 24mm flange, duckbill valve, backflow protector, tubing, SG bottle, bottle collar and bottle cap. To assure quality, these breast pump parts are genuine Spectra brand replacement parts.Please Note: This is a single kit. Buy two for double pumping.