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 available in 24mm size with a protective case for hygenic and convenient storage all nipple shields should be used under the advisement of a breastfeeding professional lansinoh contact nipple shields features ultra thin and flexible made of 100 silicone s