Jump'In - Double-jointed, large-ring gag bit (90mm)Composition: German Silver (65% copper, 23% zinc, 12% nickel) is a relaxing and strong alloy. Effect: It acts on the horse's balance by forcing it to rebalance and shift its weight onto its hindquarters. The larger the rings, the greater the effect of the gag. Usage advice: This bit requires special cheekpieces and can be used directly, with curb chains, or with four reins. Maintenance advice: Rinse the bit thoroughly after each use to limit the build