JUMP'IN D-Ring Bit w/ CopperComposition: This Waterford D ring bit features 90 mm rings and 12 mm thick cannons made of high quality copper, known for its durability and natural warmth. Effect: The D ring design helps establish a consistent frame and maintains focus, offering a practical alternative to a full cheek bit. The ergonomic cannons, with their classic simple link design, conform closely to the horses mouth for enhanced comfort. Usage Advice: While the bits thin,