Metalab Solid Mouth Stainless Steel Curb BitThe double bridle is a precision tool that must be handled with great care. The mouthpiece and shanks are independent, allowing the horse to play freely with the bit. In general, horses tend to be less tense with this bit, especially when first transitioning to a double bridle. The curb bit acts on the bars and tongue through a lever action, closing the head neck angle. It has a flexing and lowering effect. The curb bit helps flex the poll and set the