Lansinoh Contact Nipple Shields are effective tools for addressing short term latch-on issues related to premature, small, or ill infants as well as flat or inverted nipples, tongue tie, lip tie, or overactive let-down. Comes in a pair, with a protective case for hygienic and convenient storage. All nipple shields should be used under the advisement of a breastfeeding professional. The nipple shields have been specially designed to maximise skin to skin contact, are ultra thin, super soft and flexible. They are made from 100% silicone and are BPA free.