The Cotran bottle calf with handle two liter screw on nipple Bess 15 246 is a durable feeding bottle designed for easy use and cleaning Its round high density polyethylene construction allows faster cleaning and long lasting performance while the two quart size includes a built in handle and bottom cap for convenient filling The bottle comes with a clear screw on nipple with insert and ring cap made from soft synthetic rubber to reduce milk waste and improve visibility An internal silicone membrane allows milk to flow only when the calf is suckling while the two millimeter opening helps control flow and prevent tearing The natural shape encourages proper nursing and feeding efficiency