Bit Herm Sprenger in Aurigan with D-rings, ergonomic model Dynamic RS Egg Butt, with central articulated. Uniform pressure on the tongue of the horse, does not go to press the palate, maintaining a proper position don’t pinching and pressing the corners of the mouth. The central joint KK Ultra, is angled forward by 45°, this allows a good contact, constant pressure, but no compression for tongue. Thickness 16 mm, and rings 65 mm.