The Medela Contact Nipple Shield is a breastfeeding aid designed to help mothers with latching difficulties. This large size (24mm) set includes 2 ultra-thin silicone 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 can be sterilized by boiling or steaming. Ideal for addressing breastfeeding challenges like latching difficulties, inverted nipples, or sore/cracked nipples while maintaining skin-to-skin contact between mother and baby.