The KK Ultra D-Ring Bit by Herm Sprenger features a 15mm Aurigan® mouth with a center link that's shortened and rotated 45 degrees.
Ideal for busy horses or those learning new skills, the WH Ultra Loose Ring Bit by Herm Sprenger has a smooth roller disk in the center. The slight up and down motion of the roller encourages the horse to "play" with it. Aurigan® mouth. 55mm stainless steel rings. 16 mm mouth. 70mm stainless steel rings.
With a smooth, rounded port that is angled forward, the HO Weymouth bit by Herm Sprenger features a 14mm Aurigan® mouthpiece.