The Blocker Control Halter provides a safe, more humane alternative to the stud chain. Adjust the chain using the quick links so that it sits about 1 below the rubbe, across the horses nose. (See picture). When you pop the lead rop, you will engage the cable-reinforced crown and rubber noseband first. The rubber will stretc, but if the horse doesnt respond to the pressur, the chain will engag, increasing the pressure. When the horse gives to the pressur, release is immediate as the rubber noseband contracts and the chain automatically relaxes. The Control Halter is a training tool designed to improve horse handling. Do not use for turnout. Do not use on a horse with a tying problem unless used in conjunction with a Blocker Tie Ring. Legal Disclaimer - This product contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information, go to www.p65warnings.ca.gov.