Kelly Silver Star Copper Mouth Breaking Bit from JTI.
This stainless steel Tom Thumb Snaffle pony breaking bit from JT International features a copper mouth and 6" cheeks.
Sizes: 4 1/2" , 4 3/4"  , 5" 
A bit is a type of horse tack used in equestrian activities, usually made of metal or a synthetic material, and is placed in the mouth of a horse or other equid and assists a rider in communicating with the animal. It rests on the bars of the mouth in an interdental region where there are no teeth.