The Liverpool varies depending on which mouthpiece it is coupled with,
Solid mouthpieces, the cheekpieces are fixed to the mouthpiece and do not rotate on the vertical.
Broken, Semi-Broken or flexible mouthpieces, the cheekpieces rotate on the vertical, allowing the mouthpiece to set in the mouth, moving independently from the cheekpiece.
The Happy Tongue is a solid mouthpiece uniquely ported to give maximum tongue relief. The standard Happy Tongue is curved to be softer on the bars and slow in applying tongue pressure. Also available as a straight mouthpiece which is slightly stronger.

Cheekpiece

Rotating cheek providing lateral aids and allowing for variable options for the reins to adjust poll, curb and tongue pressure.

Mouthpiece

The mouthpiece is fixed between the cheekpieces, offering tongue relief in the form of a port. When used in conjunction with a Liverpool it should fit tightly to eliminate any sideward movement.