Medela Contact Nipple Shields can be an effective tool for moms to manage infants with latch-on problems, or moms with overactive let-downs or for flat, inverted and sore nipples. They allow for continued breastfeeding without interruption until these problems are resolved. Unique cut-out shape allows for more skin contact between mom and baby. Standard 24 mm. As per our returns policy, this item is not eligible for return.