Monty Roberts Official Dually Training Halter Medium/COB (with Free DVD) OFFICIAL MONTY ROBERTS Patented Schooling Halter. Adjustable double noseband High quality brass hardware is designed to breakaway under extreme pressure Designed by Monty and effectively rewards horses for acting in partnership with you. Training aid when leading, loading, long-lining Can be used as a bit-less bridle, a painless training aid or as a standard halter on the bottom ring Left & right side rings offering lateral control while driving or leading. Highly adjustable on chin, nose and poll Dually Measurements Nose- Minimum 23 in (58,4 cm), Maximum 31 in (78,7 cm) Head- Minimum 37 in (94 cm), Maximum 45 in (114,3 cm) Cheek  From Ring  Ring 8 in (20,3 cm)