Used only a few times, in excellent condition. There may be some minor scratches. Please refrain from purchasing if you are concerned about this. The baby bottle uses high-quality PPSU plastic, also used in medical devices, so it can be sterilized with boiling water, in a microwave, and in a dishwasher. The nipple is made of fluid silicone material, making it very soft and designed to mimic a mother's breast. The wide air valve on the silicone nipple facilitates air circulation, preventing the baby from swallowing too much air. It also prevents a vacuum from forming inside the bottle and the nipple from sticking. The curve is minimized for easy cleaning and drying, with no milk residue. It has a wide neck for easy formula preparation and cleaning after use.