The Mikmar bit is a training bit designed to disperse pressure to the nose, mouth (bars and tongue), chin, and poll areas, instead of to only one focused area. It is a useful tool for all disciplines of western riding. Many use it for a transition from the snaffle bit to a solid leverage bit
Here is a site that explains the Mikmar bit and its history:
www.mikmar.com/bit-pages/training-bit.html.
