Sprenger HS Rubber Mullen Mouth Bit With 20mm Straight Flexible Mouthpiece Haynets or those that are tense Colour:Worn Hickory or those that are tense and shorten the neck then our Huggate fleece waistcoats are most definitely the best choice for you All SPRENGER rubber bits have a steel cable to provide more security Rubber Mullen Mouth bit 20 mm thickness straight and flexible mouthpiecemade of soft but durable rubber that has a stainless steel cable inside to reinforce the mouthpieceexerts steady and even pressure onto the whole tongue widthCompared to metal bits rubber bits are softer and should not get in contact with the teeth of your horse