PetAg® Nursing Kits contain the equipment needed to feed newborn animals. The 2 oz Kit, designed for smaller animals, includes one 2 oz (60 ml) bottle, three regular nipples, one elongated nipple, one balloon nipple and one cleaning brush. The 4 oz Kit, made for larger animals, includes one 4 oz (120 ml) bottle, three nipples, and one cleaning brush. Each bottle features graduation marks on the side in tablespoon (15 ml) increments to make monitoring food intake easier. All nipples are flexible, latex-free, silicone nipples and replicate the natural feeding action of a mother's nipple. There are no holes in the nipples allowing you to customize the flow of the formula or weaning food. Both bottle and nipples are durable enough to stand up to hard use and can be sanitized with boiling water.