[:Made of pp and .It works better with olive oil.Medical grade silicone gel soft and odorless.High sealing performance strong suction CORRECTIVE NIPPLE:Corrective nipple depression help with inverted or flat nippleshelping your nipple regain confidence.Physical correction no need for surgery and convenientno pain and comfort you can control the strength yourself. EASY TO CARRY:Worn inside underwear portable lightweight and applicable for going out.Heat-resistant and cold-resistant easy to clean can be boiled sterilized by microwave or disinfected by liquid medicine. SUITABLE FOR:Suitable for girls pregnant women mothers etc. Attention ! 3 hours a day.When wearing a nipple appliance you can apply some skin cream around the nipple to increase the suction of the appliance. NOTE:Because the degree of nipple depression is different the correction time is generally different it takes about 2-3 months please be patient. ]