Medela offers five sizes of breast shields to meet every mum's needs and to ensure high comfort and efficiency during pumping. The PersonalFit breast shields ensure high milk volume, good breast drainage and comfortable pumping and prevent nipple trauma. For good results, combine the breast shields with the natural physiological suction rhythm of a Medela 2-Phase breast pump (like Medela Swing and Medela Symphony). Benefits Best chance of ensuring milk volume and good breast emptying. Individual and personalised fit helps to prevent nipple trauma. Convenient for travelling or for when you do not have time to clean your breast shields and need extras. BPA free – safe for you and your baby. Excellent fit for comfort and performance.