The Medela Contact Nipple Shield, 16mm, Silicone, DEHP & BPA Free, Clear, 67251, 1 Each is used for cases of latch-on difficulties or inverted nipples. Made of silicone. The unique cut-out base of the shield allows more skin to skin contact between mother and baby. Autoclavable. DEHP & BPA free. For use under professional care only while breastfeeding the baby. Not to be worn between feedings.