Terminology

Part 1 - Terminology
Part 2 - Mouthpieces
Part 3 - Considerations

Bars - the portion of each side of the mouthpiece that rests on the horse's bars (gum area between front and back teeth)

Shank - the part of the bit below the mouthpiece. It gives you leverage on the mouthpiece. The shorter the shank, the less control - the longer the shank, the more control.

Purchase - the portion of cheek above the mouthpiece. A shorter purchase means a quicker reaction.

Port - the center portion of the mouthpiece. Both the height and width are important in creating the desired amount of tongue pressure or tongue relief.