Medela Contact Nipple Shields are breastfeeding aids designed to help mothers experiencing latching difficulties or nipple discomfort. This medium-sized set includes 2 shields and a convenient storage box for hygienic storage and transport. Made from BPA-free, medical-grade silicone that is safe for baby. The shields feature an ultra-thin, transparent design that allows for maximum skin contact between mother and baby during feeding. The medium size is suitable for most mothers, but proper sizing is important for optimal use and comfort. Includes protective storage case for hygiene. Can be sterilized through boiling or steaming.