Metalab Double Ring Bit Large Hollow Copper MouthpieceThe Metalab Copper 2 ring bit is made from stainless steel with a large hollow copper mouthpiece of 23 mm. This 2 ring bit is very gentle and encouraging for the horse. Copper encourages salivation and promotes better relaxation of the horse's mouth. The hollow, wide and lightweight mouthpiece offers a very gentle contact with the horse's mouth. This bit is ideal for horses with a tense or resistant mouth. Composition Copper Rinse with clean water