Also known as the continental or three ring gag. This bit can be used
with one or two sets of reins, or Pelham Roundings, with the bridle
cheek pieces attatched to the top rings to produce poll pressure. The
reins can be fitted to either of the lower rings: the lower the reins
are fitted the stronger the leverage.

The copper lozenge encourages acceptence of the bit and salivation.