The Miller Mfg nursing bottle with snap on nipple three quart is a sturdy and sanitary feeding solution made from FDA compliant food grade polyethylene plastic that is both durable and translucent allowing you to easily monitor the liquid level The included nipple is crafted from a special rubber formula designed to extend its life and improve flexibility for better feeding performance The bottle also features a convenient snap on top for quick and secure assembly making it a practical choice for feeding calves and other young livestock