Four Paws milk bottle sets are designed by veterinarians and professional breeders and are suitable for feeding different newborn animals, such as puppies, kittens, hamsters, gerbils, guinea pigs, rabbits, squirrels, monkeys, mice, etc. Before using it for the first time, please use a heated needle to pierce a hole of appropriate size on the nipple, or use a blade to make a small cross-shaped opening. The set includes 2 2oz milk bottles and 4 pacifiers.