Used. 
Dynamic RS bits are shaped in such a way that they lie anatomically correct between tongue and palate and do not exert pressure on sensitive parts of the mouth. They are a further development of the KK ULTRA bits. The middle link or joint is angled forward by 45° and uses the sensitive sense of touch of the tongue. Thanks to the ergonomic shape, the rein aids reach the horses mouth in a more targeted manner. The pressure generated by the rein aid is distributed over the entire tongue, which acts like a cushion in the mouth. The mouthpiece fits perfectly into the tongue and mouth contours and the effect is precise and effective.