This is a side pull hackamore attachment that fits on your own bridle. It does not tighten down on the nose when the reins are pulled back. It is hand braided our of a high quality nylon 550 paracord. You can choose from a Black or Brown under color and chinstrap color. Sizes measure around the nose where the halter noseband fits. mini or small pony .....nose up to 17" cobb or large pony....nose up to 19" average horse......nose up to 23" large horse.....nose up to 26" draft horse.....nose up to 31 ____________________________________________________