These BPA-free nipples by Green to Grow™ are made of clear medical-grade silicone. Heat resistant, non-toxic and odorless, they are free of nitrosamines. This standard-neck nipple is contoured like typical bottle nipples for babies comfortable with being bottle-fed. As a beginner-stage nipple, it allows for a slower flow of liquid. Suitable for infants zero to three months. Dishwasher safe. Package includes three standard-neck nipples.