From Medela
Product Highlights: - Enable breastfeeding when latching on is difficult or painful or if you have flat or inverted nipples - Protect sensitive, dry or cracked nipples during breastfeeding - Made from transparent, ultra-thin, soft silicone that's comfortable on sensitive skin - Safe and taste-free for your baby - Shape maximises skin contact between you and your baby - BPA free What's in the box? 2 x Contact nipple shields 1 x handy box Product Dimensions: 2.5 x 2.5 x 2.5 cm Item Weight: 30 g Material Type: Silicone Size Guide Available in three sizes: S/16 mm, M/20 mm or L/24 mm.