The Robart Stainless Steel Pinchless Bit System incorporates a revolutionary patented design feature. The arms of the bit contain an internal bushing system, which permits either side of the bit to rotate independently of the other side. This means there is nothing in the mouthpiece to entrap the horses tongue or bruise the palate. It also allows pressure from the rein to occur only on one side of the mouth that is required, making the riders instructions to be perfectly clear and with out confusion.