What is a triangle mouthpiece? Instead of the mouthpiece being round, it's triangle-shaped, and the thin edge (think top of the triangle) rests against the corner of the mouth. This bit has a little more "bite" than a normal snaffle — not sharp like a knife, but because it's thinner, it is stronger.
The full cheek has simple action on the lips. The main feature of the full cheek is to help steering by giving lateral control.
Available in 4" mouth with 4 1/2" cheeks and 4 3/4" mouth with 6 1/2" cheeks.