I have never heard of these but I ordered them at my granddaughter's request for her son. She and her friends swear by them and have used them for awhile. This nursing necklace is made of food grade silicone so it is safe for baby. It gives the baby something to chew on or play with while breastfeeding. It is modern looking and a great gift for showers, new baby. Recommend. #RankBoosterReviews #Sponsored #Tuxepoc