This set includes five Dr. Brown's Natural Flow anti-colic baby bottles with level 1 nipples, each with a capacity of 120ml/4oz. The bottles feature a narrow neck and are made of BPA-free plastic, while the nipples are made of silicone and have a slow flow. In addition to being easy to clean and dishwasher safe, these bottles are microwave safe and designed to mimic the breast, making them ideal for infants aged 0 months and up. The clear color and anti-colic nipple design make these bottles a great choice for parents looking to give their babies a comfortable and natural feeding experience.