Sprenger Duo bits are very gentle on the horse¹s mouth. The mouthpiece is made of soft, flexible plastic which adapts to the horse¹s 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. Different from pure metal bits there is the danger of the plastic being easily bitten through when the bit is not attached correctly and gets in contact with the teeth. No returns or exchanges are possible if there are chew marks on the mouthpiece.