Having Extra Accessories For Your Spectra Breast Pump Makes Life So Much Easier, So You Can Always Have Clean Parts. The Wide Neck Spectra Breast Shield Is Compatible With All Spectra Breast Pumps. It Is Available In Various Sizes: 16Mm, 20Mm, 24Mm, 28Mm, 32Mm. All Parts Are Easy To Assemble/Disassemble, Also Easy To Wash For Your Next Use. Furthermore, All Spectra Products That Come In Contact With Breast Milk Are And Always Have Been Made Without Bpa, Making Sure Your Milk Keeps Its Beneficial Properties Unaltered.