Oxygen is critical to all life. The more oxygen a horse can receive while racing, the more endurance and stamina it will have. Jet Breath is a natural bronchial dilator, opening up the bronchial tubes allowing more oxygen to be pulled into the lungs to be delivered to the blood. Muscles naturally work harder and last longer with a better supply of oxygen. Instead of your horse gasping in defeat, let him breath freely in the winners circle. 3 lbs.