Stainless Steel 7" Flat Shank with Sweet Iron Mullen Triple Barrel (MB 32-3) Copper Inlay Mouth. This mouthpiece is made of polished Sweet Iron which naturally oxidizes. About the mouthpiece: the 32-3 is the Myler alternative to a traditional mullen. It has three barrels which turn the mouthpiece from the typical solid bar of a mullen into a ?exible bar which allows the horse to elevate his tongue and swallow more easily under the bit. When the reins are engaged, the 32-3 becomes a solid bar like a traditional mullen, but with an exaggerated curve. This curved bar rotates across the bars and lips down on to the tongue, applying pressure across the entire surface of the tongue. The ?exibility of the 32-3 makes it very forgiving and comforting when relaxed, but o?ers the rider control when engaged. The pressure on the tongue is distributed across all three barrels, which also create the Independent Side Movement . Because the tongue pressure applied by the 32-3 is evenly distributed across the entire tongue, this mouthpiece is considered "stronger" than the 04. However, its ?exibility makes it a forgiving mouthpiece that works well for horses who have su?ered mouth trauma or damage, or horses that tend to go behind the bit. For a ported mullen style o?ering more tongue relief, see the 06 or 36. From The Level Best for Your Horse by Dale, Ron and Bob Myler. ⓒToklat Originals, Inc.