NRSHinged Port Correction BitCopper RollerCopper Bars6" Cheek5" Mouthpiece175309This NRS Hinged Port Correction Bit features copper bars and a copper roller for increase salivation and taste appeal. The hinged port provides a great deal of flexibility in the mouth and allows you to pick up one rein and work with just that side of the horse's mouth. Subtle rein cues with a hinged port can help a horse collect, balance, and lift its shoulder at speed. Engraved detail on 6" cheek.