One breastshield insert. This piece fits INSIDE the standard breastshield to make a smaller opening (21mm). This part is NOT a breastshield - it is only an insert. This part used to be included inside the breastshields in all new Pump In Style Original Breastpumps. Many moms thought it was a required part of the shield, but it is not. The 21mm size of the breastshield insert is the same size as the new PersonalFit small size breastshield.
Medela Item #8100062