Size: 5-1/8 Inches, Ideal For Medium To Large Horses. Mouthpiece: The Sweet Iron Twist Dogbone Design Promotes Comfort While Providing A Unique Feel That Encourages Better Responsiveness From The Horse. Gag Action: The Gag Design Allows The Reins To Slide Through The Cheekpieces, Offering Increased Leverage And Control, Which Can Help Lift The Horse’S Head And Encourage Proper Positioning. Purpose: Suitable For Horses That Need More Guidance Or Correction, Especially During Training Or Competition. Versatility: Designed For Advanced Riders And Trainers Seeking More Refined Control During Performance Or Training. 5-1/8" Mouth 3" Cheeks, Curb Chain