This listing is for 1 bulk units. The NUK Orthodontic Nipple is the closest alternative to natural breastfeeding. It supports seamless switching from breast to bottle. Fits NUK Orthodontic Bottles. Orthodontic nipple promotes healthy teeth formation. Available in Slow, Medium and Fast flow. Reduces Colic. Simulates and supports breastfeeding. Hourglass shape allows the lips to close properly making it easier to breathe through the nose and avoid intake of air through the mouth. Asymmetrical widening encourages to move their lower jaw forward which contributes to correct repositioning. Ventilation hole regulates the intake of air and prevent the nipple from retracting. Extra wide base mimics the shape of the natural breast. Soft, clear silicone nipples. NUK Orthodontic Replacement Nipples help support healthy oral development Features unique NUK Air System which helps to reduce colic Natural shape nipple allows easy back and forth between breast and bottle Drinking hole specially located on the top side of the nipple - versus the tip on round bottle nipples - that promotes better, easier digestion Fits all NUK wide neck bottles