Ameda - Custom Fit Flanges. Ameda -Custom fit flanges is carefully made to the highest safety standards. Designed to help mothers express breast milk safely and quickly. BPA free. Hospital Trusted. Easy to assemble discreet to use Flange fit for better breast pump Soft applicator pad makes suction comfortable Variable sizes(28.5mm/30.05mm) for the better bit Safe to use and sterilize Lightweight one-hand operation Compact in size convenient to carry