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KU.KU Duckbill Anti -Colic Wide Neck Breast-Like Nipple - Cross Cut L Size By Offering the best nipple , bottle feeding can deliver happiness to the smartest mother .As a leader of using the rated 20 hardness which is supple and best suitable for your little one . The nipple is made from medical and grade liquid silicone which is a high purity platinum cured silicone . It features odorless , colorless and stainless quality . Collaborating with the unique design of the first ever patented horizontal cut ventilated valve . Provides the closet feeling to the natural breast feeding .