Dairy Tech Perfect Udder Narrow Esophageal Feed tubes for small calves has a reduced diameter safety bulb and is more flexible.  Smaller calves can now be tube-fed without worry or concern that the tube is irritating the sensitive tissue in the laryngeal region.  Please know that while the safety bulb was designed to resist insertion  into the trachea, it is still possible.  It is important to get instructions and training on how to properly use an esophageal tube feeder.  Recommended for calves weighing less than 66lbs.