Herm Sprenger Duo Bits are very gentle on the horse’s mouth. The mouthpiece is made of soft, flexible plastic which adapts to the horse’s mouth in an ideal way. The material is food-safe, solvent-free and does not contain any plasticisers. The mouthpiece is reinforced with a steel cable to make it stable and to provide more security. This bit can be used on both sides, either as a straight edged flexible bar or with a low port that leaves space for the tongue.