Dr. Brown"S 2 Pack Natural Flow Y Cut Wide Neck Nippletwo Replacement Silicone Nipples, Exclusively For Dr. Brown"S Natural Flow Wide Neck Baby Bottles. Y-Cut Nipples Are Ideal For Faster Flow For Thicker Liquids. Features Include: •Two Replacement Silicone Nipples •Y-Cut Nipples Are Ideal For Faster Flow For Thicker Liquids •Exclusive For Dr. Brown"S Natural Flow Wide Neck Baby Bottles •Dishwasher Safe-Top Rack Only