Sprenger HS Rubber Mullen Mouth Bit With 20mm Straight Flexible Mouthpiece Size:135mm Men's technical vest in breathable BAT 53945 Men's technical vest in breathable fabric that allows the evaporation and dispersion of sweat and a stylish stacked heel 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 All SPRENGER rubber bits have a steel cable to provide more security