Features: 1.Made of rubber material, can be installed in the feeding bottle and other equipment, so that the calf can feel like drinking milk from the mother. 2.Safe, non-toxic, and practical to use. 3.Help the calf drink milk in a natural speed, produce a lot of saliva, help digestion. 4.Intermittent feeding to avoid foreign body pneumonia. 5.Please clean the left milk, should be washed in water and acid, lye or disinfectant every week. Specification: Features: Made of rubber material, can be installed in the feeding bottle and other equipment, so that the calf can feel like drinking milk from the mother. Safe, non-toxic, and practical to use. Help the calf drink milk in a natural speed, produce a lot of saliva, help digestion. Intermittent feeding to avoid foreign body pneumonia. Please clean the left milk, should be washed in water and acid, lye or disinfectant every week. Specification: Material: rubber Color: red Length: approx. 10.7cm/4.2inch Diameter: 6.2cm/2.4inch Package list: 5 * Calf Pacifier