Mustang Be Good Control Poly Rope Halter This halter is made from 5 8″ braided poly rot resistant rope with six brass plated buttons along the pole and custom designed brass plated hardware for easy on-off and adjustments. This training device aids in teaching a horse to lead or to correct a horse who resists to pull away. Size: Average Horse (800-1100lbs). Features: 5 8″ braided poly rot resistant rope Custom designed brass plated hardware Trains horse to lead or corrects a horse who resists to pull awayTrains horse to lead or corrects a horse who resists to pull away. Custom designed brass plated hardware. 5 8″ braided poly rot resistant rope.