The Sweet Iron bits are known for the sweet taste of the mouthpiece. In addition, the bits are anatomically shaped and available in many shapes and sizes. This double broken bust bit is made of solid stainless steel combined with a sweet iron coating on the mouthpiece (blue). The sweet iron coating on the mouthpiece stimulates the production of saliva. When this material reacts with moisture, heat and air, it will oxidize and develop a sweet-tasting surface rust. This aids in the acceptance of the bit. Eventually the blue color disappears, but the taste of the surface rust remains. The anatomical design follows the shape of the horse's mouth, providing gentle and even pressure distribution. With a double broken bit, the mouthpiece consists of three parts, the middle part of which lies flat on the tongue. This creates more pressure on the tongue than with a single broken mouthpiece. The thicker the middle part, the more pressure on the tongue. The mouthpiece has a thickness of 14 mm and the bit rings have a diameter of 65 mm. A bust bit has rings that do not rotate freely, therefore aids act more directly. This type of bit is generally well accepted because the mouthpiece lies relatively firmly in the mouth.