Bibs Natural Rubber Pacifier from Denmark The nipple made of natural rubber material is softer than those made of silicone rubber and fits naturally in the baby's mouth. [Arch Structure to Reduce Friction] The arched shape against the mouth reduces friction with the skin. [Holes to Release Air] Holes that blend into the design release air and saliva, making it less stuffy and comfortable to wear. [Round Nipple Similar to a Nipple] Encourages a sucking method similar to breastfeeding, "wrapping the nipple with the tongue." [Soft Natural Rubber] The nipple has a valve to release air, and as the baby sucks, the air escapes, naturally fitting the shape of the mouth. ※There is a dent in the transparent part of the top of the box. There is no problem with the product (see photo 7) Thank you for viewing.