Toxin free, heat resistant, and made of durable silicone, with Green to Grow Replacement baby bottle nipples, your baby won’t know the difference! Free of nitrosamines found in conventional rubber nipples, transparent and odorless silicone guarantee your baby’s satisfaction. Green to Grow is in the business of making baby products, and fortunately for you, safety has always been at the top of their list. This particular dishwasher safe nipple has a wide neck and a slow flow speed for beginners (0-3 months). Nitrosamine free, odorless, heat resistant, medical grade silicone