NOW WITH INNOVATIVE MEDELA FLEX TECHNOLOGY THAT ADAPTS TO YOU: Engineered with advanced Flex technology, our PersonalFit Flex breast shields allow you to pump comfortably in a variety of positions, while a 105-degree opening angle helps reduce pressure REMOVES 11.8% MORE MILK PER MINUTE: Medela PersonalFit Flex breast shields remove significantly more milk and help moms pump more milk than pumping with traditional breast shields - so you can maximize your pumping efficiency and optimize milk output. CONVENIENT RANGE OF SIZES TO CHOOSE FROM: With 4 size options - including our 30mm breastshield - and compatibility with all Medela breast pumps, mom can find the most comfortably fitted breast shield for her unique body while avoiding discomfort MADE WITHOUT BPA: Like all other Medela breast pump parts and accessories that come into contact with breast milk, our PersonalFit Flex breast shields are - and have always been - made without BPA and are instead made with food-grade plastic Connectors sold separately. The PersonalFit Flex Breast Shields should be washed and sanitized prior to first use. They should continue to be washed after each use and sanitized once daily.