Small (red): Fits ponies and weanlings from 300 to 700 pounds; maximum noseband size is 29 inches and minimum size is 17 inches* The Dually Training Halter, designed by Monty, is a patented schooling halter that effectively rewards horses for acting in partnership with the handler. This useful training aid will maximise your potential for success when leading, loading, long-lining and more. Comes with instructional DVD and booklet. *When measuring your horse, please measure just below the cheekbone.