The Adiri NxGen Nipple is made of the highest Medical Grade Silicone, fine-tuned by advice from practitioners, scientists, lactation consultants, cutting edge designers, engineers and most important of all, moms. The shape and feel was resulted from what babies want most out of a nipple, the suppleness and softness of a mother's breast. There is nothing more natural and important than a mother's connection with her child, which is what Adiri strives for with the NxGen Nipple. Soft Medical grade Silicone Nipple resembles the shape and feel of a mother's breast. Supports an easy transition from Mother's breast to bottle. Design allows for use with all other Adiri NxGen Nurser sizes (5.5oz and 9.5oz). Dishwasher safe (top rack only). BPA-Free. Single pack. Designed for 9 plus months of age. Made from PP plastic and 100 percent medical Grade Silicone