The design is really simple, its a mouth piece usually jointed in the middle and connected by two rings. Each side of the bit works works independently mostly on the corners of a horses mouth. It allows your horse to follow a simple and direct feel from the reins. It has a one to one ratio meaning that one pound of pressure in your hands equals one pound of pressure being applied to your horses mouth. Unlike a 7 inch shank bit with a 7 to one ratio you'd be applying 7 pounds of pressure to you horse's mouth, unless you know what you doing. To ride with something like that your hands must be very light & you must be very experienced.
So basically you don't need anything other than a snaffle unless you are an experienced horseman. With a snaffle bit I like to use a half inch leather curb strap, not a curb chain. The strap is the to prevent pulling the bit through the horses mouth. It is also less severe than a curbed chain I actually never use a curb chain on any of my horses. I always use leather, I just think that leather is more natural and more comfortable to my horses.
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