Sturdily constructed balling guns feature metal fabrication to resist corrosion for long, trouble-free use. Heads are reinforced for extra strength to resist breakage. 1.5" x 3/4" Steel Head with Spring Clip. The thumb ring and finger rings are zinc die cast, the plunger body shafts are brass and the plungers are aluminum. Three sizes of reusable metal balling guns in two styles; metal head or plastic head. Steel heads are ideal for animals that may bite the bolus applicator. To aid in the medical application of a single bolus via an oral route of administration.Pull the plunger back by grasping the thumb ring and insert the bolus into the head. The bolus should fit snugly. Do not force the bolus into the head or when the plunger is released it could cause damage to the bolus. Insert the gun head into the animals mouth at the side, center to the front of the throat, push on the plunger and release the bolus. Be cautious and do not force the balling gun too far down the throat or damage to the pharynx may occur. After the bolus is released, wait to make sure it is swallowed. Slowly pull straight back and remove from the mouth. Clean with soap and water. Always use extreme caution.