Made of high quality PP, healthy and safe. It works best with olive oil or cream. Correcting inverted nipples will naturally help your nipples to become inverted or flat, helping your nipples regain confidence. Clinically proven to help treat inverted or flat nipples and includes a replacement air valve. Suitable for pregnant women, mothers, etc. Attention 3 hours a day. When wearing a nipple brace, you can apply some skin cream around the nipple to increase the suction power of the brace. Since the degree of nipple recess is different, the correction time is generally different. It takes about 2-3 times a few months, so please be patient. Package includes: 2* nipple correctors Note: 1. Please allow a little error due to manual measurement. Please make sure you don't mind before bidding. 2. Color may vary due to different monitors, please understand. Hello, please pay attention to your delivery address when purchasing products. If your delivery information (such as name, street, house number, doorbell/mailbox without name, etc.) is incorrect, the order will not be delivered correctly.)